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	Index: trunk/ChangeLog
	===================================================================
	--- trunk/ChangeLog (revision 421)
	+++ trunk/ChangeLog (revision 422)
	@@ -1,1675 +1,1682 @@
	+2020-04-22 Gregory Soyez <soyez@fastjet.fr>
	+
	+ * siscone/spherical/geom_2d.h:
	+ * siscone/geom_2d.h:
	+ replaced 1 by 1u in bitshift operation to avoid a potential
	+ sign/unsigned issue (reported by Andrii Verbyitskyi)
	+
	2018-10-01 Gregory Soyez <soyez@fastjet.fr>

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	changed version to 3.0.5-devel

	2018-10-01 Gregory Soyez <soyez@fastjet.fr>

	Release of SISCone 3.0.4

	* NEWS:
	set the proper release date

	2018-09-26 Gregory Soyez <soyez@fastjet.fr>

	* NEWS:
	fixed typos (FJ release number, ...)

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	changed version to 3.0.4

	* NEWS:
	prepared for the release of SISCone 3.0.4

	* siscone/spherical/Makefile.am:
	added libsiscone as a dependence of libsiscone_spherical

	2018-09-19 Gregory Soyez <soyez@fastjet.fr>

	* BUGS:
	updated email addresses (mostly testing the new HEPforge system)

	2016-08-03 Gregory Soyez <soyez@fastjet.fr>

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	changed version to 3.0.4-devel

	2016-08-03 Gregory Soyez <soyez@fastjet.fr>

	Release of SISCone 3.0.3

	* doc/html/index.html.html:
	* doc/html/download.html:
	updated documentation with 3.0.3 release info

	* NEWS:
	prepared release notes for SISCone 3.0.3

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	changed version to 3.0.3

	* setversion.sh:
	updated script so that the version is properly set in
	configure.ac, Doxyfile and the doc

	2016-05-23 Gregory Soyez <soyez@fastjet.fr>

	* examples/Makefile.am:
	replaced top_builddir by .. [consistency with the same trick
	already used in the spherical source code

	* siscone/Makefile.am:
	* siscone/spherical/split_merge.h:
	same sort of fix as in the "spherical" case to make sure that the
	config.h file is correctly found in a VPATH build

	2016-05-22 Gregory Soyez <soyez@fastjet.fr>

	* examples/Makefile.am:
	added the top_builddir to the list of includes so that
	siscone/config.h is found on a vpath build

	* siscone/spherical/split_merge.h:
	included <siscone/config.h> instead of "../config.h". This makes
	life eassier for a vpath build

	2016-05-19 Gregory Soyez <soyez@fastjet.fr>

	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	remove unneeded commented out code

	2016-03-29 Gregory Soyez <soyez@fastjet.fr>

	* siscone/split_merge.h:
	* siscone/spherical/split_merge.h:
	used SISCONE_USES_UNIQUE_PTR_AS_AUTO_PTR from config.h

	* configure.ac:
	put (SISCONE_)USES_UNIQUE_PTR_AS_AUTO_PTR in config.h

	* siscone/siscone.{h,cpp}:
	* siscone/spherical/siscone.{h,cpp}:
	* siscone/defines.h:
	PACKAGE_NAME -> SISCONE_PACKAGE_NAME
	VERSION -> SISCONE_VERSION

	* siscone/Makefile.am:
	included config.h in the list of distributed headers.

	* configure.ac:
	* Makefile.am:
	* m4/ax_config_header_h.m4: * ADDED *
	prefixed the entries in config.h by SISCONE_ to avoid conflicts
	with other packages if we want to include it in a header file.

	2016-03-16 Gregory Soyez <soyez@fastjet.fr>

	* configure.ac:
	* Doxyfile:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	bumped version number to 3.0.3-devel

	2016-03-16 Gregory Soyez <soyez@fastjet.fr>

	Release of SISCone 3.0.2

	* NEWS:
	tweaked as suggested by Gavin

	* doc/html/usage.html:
	* doc/html/index.html:
	backported a change done on the Hepforge pages

	* doc/html/algorithm.html:
	* doc/html/index.html:
	* doc/html/sm_issue.html:
	* doc/html/download.html:
	* doc/html/perfs.html:
	* doc/html/usage.html:
	set version number to 3.0.2; updated a few links and mention the
	new release

	* Doxyfile:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	* configure.ac:
	set version number to 3.0.2

	* NEWS:
	drafted for v3.0.2

	2016-03-10 Gregory Soyez <soyez@fastjet.fr>

	* siscone/split_merge.h:
	* siscone/spherical/split_merge.h:
	switched the auto_ptr into unique_ptr when
	SISCONE_USES_UNIQUE_PTR_AS_AUTO_PTR is defined

	* configure.ac:
	fine-tuned the configure test for auto-ptr deprecation [for god
	knows what reason, -Werror does not turn -Wdeprecated-declarations
	into errors for gcc-5.2.1... so I replaced it with
	-Werror=deprecated-declarations which does]

	* configure.ac:
	added a series of tests to check if the compiler considers
	auto_ptr as deprecated and, if yes, supports unique_ptr

	2016-03-03 Gregory Soyez <soyez@fastjet.fr>

	* siscone/spherical/siscone.cpp:
	* siscone/siscone.cpp:
	restored the original _banner_ostr stream format flags after
	printing out the banner

	* siscone/spherical/split_merge.cpp:
	* siscone/split_merge.cpp:
	removed unnecessary (dead) code at the end of get_sm_var2()

	* siscone/spherical/split_merge.h:
	* siscone/spherical/split_merge.cpp:
	* siscone/split_merge.h:
	* siscone/split_merge.cpp:
	initialised pass to CJET_INEXISTENT_PASS by default

	* siscone/vicinity.cpp:
	initialised ve_list before calling set_particle_list

	2016-02-29 Gregory Soyez <soyez@fastjet.fr>

	* doc/html/download.html:
	updated link to html browsing og the svn repo

	* doc/html/usage.html:
	updated a couple of links to the FJ doxygen pages

	* configure.ac:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	* Doxyfile:
	switched version number over to 3.0.2-devel

	2016-02-29 Gregory Soyez <soyez@fastjet.fr>

	Release of SISCone 3.0.1

	* NEWS:
	* CHECKLIST:
	* Doxyfile:
	* configure.ac:
	* doc/html/*.html:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	prepared for the release of SISCone 3.0.1

	2016-02-24 Gregory Soyez <soyez@fastjet.fr>

	* siscone/spherical/geom_2d.h:
	get_theta_cell(...): fixed rounding issue for theta==pi
	[Bug reported by Andrii Verbytskyi, see
	2016-02-SphericalSISCone-throws in the FastJet issue tracker]

	* siscone/spherical/geom_2d.cpp:
	add_particle(...): made sure the full phi range is included for
	theta=0 or theta=pi

	* siscone/spherical/geom_2d.h:
	fixed typo in comment:

	* siscone/spherical/split_merge.cpp:
	* siscone/split_merge.cpp:
	fixed bad variale in debugging outpout and added debugging info


	2014-09-10 Gregory Soyez <soyez@fastjet.fr>

	* Doxyfile:
	* configure.ac:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	set version number to 3.0.1-devel

	2014-09-09 Gregory Soyez <soyez@fastjet.fr>

	* SISCone 3.0.0

	* doc/html/usage.html:
	* doc/html/perfs.html:
	added a brief discussion about the algogithm complexity.

	2014-09-09 Gavin Salam <gavin.salam@cern.ch>

	* NEWS:
	* doc/html/index.html:
	* doc/html/usage.html:
	small phrasing changes

	2014-09-09 Gregory Soyez <soyez@fastjet.fr>

	* configure.ac:
	* NEWS:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.cpp:
	* Doxyfile:
	preparing for the release of SISCone 3.0.0

	* doc/html/*.html:
	changed the version number to 3.0.0
	included the release information
	updated Gavin's email address

	* doc/html/usage.html:
	added a description of SISCone with progressive removal

	* Doxyfile:
	Updated for more recent versions of doxygen [ran doxygen -u from
	doxygen 1.8.8]

	2014-09-04 Gregory Soyez <soyez@fastjet.fr>

	* siscone/split_merge.cpp:
	* siscone/spherical/split_merge.cpp:
	in progressive removal mode, set the 'pass' index associated to
	each jet to the index of the iteration at which it has been
	obtained

	* siscone/siscone.h:
	* siscone/siscone.cpp:
	* siscone/spherical/siscone.h:
	* siscone/spherical/siscone.cpp:
	put the duplicated code for initialisation in a spearate method

	* siscone/split_merge.cpp:
	fixed a bug introduced in a recent commit: jet_candidate.sm_var2
	was not assigned prolperly for non-user-defined scales

	* siscone/spherical/split_merge.cpp:
	* siscone/spherical/split_merge.h:
	propagated recent modifications of SISCone to the spherical
	version:
	. reworked some comments (including the misplaced one about
	collinear-safety)
	. default for SM_var2_hardest_cut_off changed from -1 to
	-numeric_limits<double>::max() [largely redundant]
	. added support for user-defined scale when run in
	"progressive-removal mode"

	* siscone/split_merge.h:
	. removed temporary comments at the top of the file
	. added a dummy virtual dtor to Csplit_merge::Cuser_scale_base

	2014-09-04 Gavin SALAM <gavin.salam@cern.ch> + Gregory

	* siscone/split_merge.cpp:
	SM_var2_hardest_cutoff no longer applied to PR case.

	Modified sm_var2 in (PR) _user_scale case to now be the signed
	square of the scale variable (to properly handle negative values
	of the scale).

	default for SM_var2_hardest_cut_off changed from -1 to
	-numeric_limits<double>::max(); (this change is largely redundant,
	given that SM_var2_hardest_cutoff is no longer used for PR, while
	the SM case only allows default scale choices, which are all
	positive definite).

	replaced <math.h> with <cmath>;

	* siscone/split_merge.h:
	default Cuser_scale_base::is_larger(...) now uses cached values of
	scale in Cjet.

	small fixes to a number of comments, including misplaced warning
	about collinear unsafety.

	* siscone/siscone.h:
	small changes to comments to clarify situation of an unused
	variable in progressive removal

	2014-09-04 Gregory Soyez <soyez@fastjet.fr>

	* siscone/split_merge.cpp:
	* siscone/siscone/split_merge.h:
	added material to support user-defined scale choices in
	progressive-removal mode.

	One needs to overload the Csplit_merge::Cuser_scale_base class and
	pass a pointer to the split-merge using set_user_scale().

	2014-09-03 Gregory Soyez <soyez@fastjet.fr>

	* siscone/spherical/siscone.h:
	* siscone/spherical/siscone.cpp:
	* siscone/spherical/split_merge.h:
	* siscone/spherical/split_merge.cpp:
	ported "siscone with progressive removal" to the spherical
	coordinates version

	* siscone/siscone.h:
	fixed typo in variable name

	* siscone/split_merge.cpp:
	imposed the SM_var2_hardest_cut_off in the progressive case too
	+ made sure at least one candidate jet was found

	* siscone/siscone.h:
	* siscone/siscone.cpp:
	added compute_jets_progressive_removal(...) which implements a
	"progressive removal" version of SISCone. This successively
	computes stable cones and removes the hardest stable cone as a jet
	until no particles are left or no stable cones are found.

	Question: what do we do with 'protocones_list'? [for the time
	being, it's left empty]

	* siscone/split_merge.h:
	* siscone/split_merge.cpp:
	added 'add_hardest_protocones_to_jets' which computes the hardest
	of the stable cones passed as arguments, declares it as a jet and
	removes its content from the remaining list of particles. This
	should be used instead of add_protocones()+perform() if one wants a
	progressive-removal version of SISCone.

	2013-04-09 Gregory Soyez <soyez@fastjet.fr>

	* doc/html/index.html:
	fixed trivial typo (developper -> developer)

	* switched version number to 2.0.7-devel

	2013-04-09 Gregory Soyez <soyez@fastjet.fr>

	* Release of SISCone 2.0.6

	* NEWS, doc/html/index.html
	set the release date to April 9th

	* Doxyfile
	Set version number to 2.0.6

	2013-04-08 Gregory Soyez <soyez@fastjet.fr>

	* doc/html/*.html:
	* configure.ac:
	switched version number to 2.0.6

	* NEWS:
	preparing for SISCone 2.0.6

	* setversion.sh: minor fix (used bash instead of sh)

	* CHECKLIST: * ADDED *
	helper checklist for the release process

	2013-04-06 Gavin Salam <gavin.salam@cern.ch>

	* configure.ac:
	updated minimal required autotools version to 2.63

	2013-02-05 Gavin Salam <gavin.salam@cern.ch>

	* autogen.sh: tried to be more tolerant of different libtool
	versions (some take --version, others -V). Still have problems
	on OS X 10.8 with macports , but autoreconf works fine.

	* configure.ac:
	replaced AM_CONFIG_HEADER with with AC_CONFIG_HEADERS, following
	error with autoconf 2.69 on OS X 10.8 with macports.

	2013-02-04 Gregory Soyez <soyez@fastjet.fr>

	* siscone/Makefile.am:
	do not install config.h

	* siscone/spherical/Makefile.am:
	fixed directory for headers installation for the spherical
	version of SISCone

	2012-01-17 Gregory Soyez <soyez@fastjet.fr>

	* NEWS:
	SISCone 2.0.5

	* NEWS:
	* configure.ac:
	* Doxyfile:
	prepared for the release of SISCone 2.0.5

	* siscone/spherical/Makefile.qm:
	used $(includedir) instead of $(prefix)/include

	2012-01-13 Gregory Soyez <soyez@fastjet.fr>

	* siscone/Makefile.am:
	used $(includedir) instead of $(prefix)/include

	2011-11-25 Gregory Soyez <soyez@fastjet.fr>

	* NEWS:
	SISCone 2.0.4

	* NEWS:
	updated in preparation for the 2.0.4 release

	* doc/html/home.png: * ADDED *
	* doc/html/usage.html:
	* siscone/siscone_error.h:
	* doc/html/index.html:
	fixed typos; updated html links.

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	updated the version number to 2.0.4 and the release information

	* siscone/spherical/siscone.cpp:
	* siscone/spherical/siscone.h:
	* siscone/siscone.cpp:
	* siscone/siscone.h:
	allowed to redirect the banner to a different stream than cout

	2011-11-16 Gregory Soyez <soyez@fastjet.fr>

	* examples/test.cpp:
	cast a vector size (of type size_t) onto unsigned int to avoid a
	compiler warning (on either 32 or 64-bit machines)

	2011-11-15 Gavin Salam <salam@lpthe.jussieu.fr>

	* AUTHORS:
	updated my address.

	2011-11-15 Gregory Soyez <soyez@fastjet.fr>

	* siscone/protocones.cpp (is_inside, proceed_with_stability):
	* siscone/spherical/split_merge.cpp (init):
	* siscone/split_merge.cpp (init):
	* siscone/siscone_error.h:
	* siscone/area.cpp (compute*_areas):
	renamed or commented out a few local variables and method
	arguments to avoid shadowing class members (gcc -Wshadow)

	* examples/spherical.cpp:
	* examples/sample.cpp:
	removed unused argc, argv parameters

	* examples/spherical.cpp:
	* examples/sample.cpp:
	* examples/times.cpp:
	* examples/test.cpp:
	* examples/area.cpp:
	* examples/main.cpp:
	* siscone/spherical/split_merge.cpp (save_contents, show):
	* siscone/split_merge.cpp (save_contents, show):
	* siscone/quadtree.cpp (save, save_leaves):
	got rid of a few format warnings by replacing %le and %lf by %e
	and %f (the l prefix applying to int and unsigned int) + a couple
	of signed/unsigned mismatches (%d -> %u)

	* configure.ac:
	switched version number to 2.0.4-devel

	2011-10-05 Gregory Soyez <soyez@fastjet.fr>

	* NEWS:
	SISCone 2.0.3

	* AUTHORS:
	updated addresses and phone numbers

	* configure.ac:
	* Doxyfile:
	* doc/html/*.html:
	updated the version number and the release information

	* Doxyfile:
	removed the treeview

	* siscone/reference.cpp:
	removed redundant operator + (following a gcc warning)
	Checked with FastJet's regression check that it was indeed not
	used

	* siscone/spherical/protocones.cpp:
	removed an unused variable

	2011-08-09 Gregory Soyez <soyez@fastjet.fr>

	* siscone/spherical/split_merge.h:
	fixed the description of E_tilde. It was
	sum of E_i [ 1 + sin^2(theta_iJ) ]
	but in practice we used
	sum of E_i [ 1 +\|p_i x p_J\|^2/(\|p_i\|^2 E_J^2)]
	as mentioned further down in the ChangeLog (that avoids
	potential issues when a protojet has a zero 3-momentum)

	2011-05-17 Gregory Soyez <soyez@fastjet.fr>

	* configure.ac, Doxyfile & NEWS:
	SISCone 2.0.2

	2010-10-27 Gregory Soyez <soyez@cern.ch>

	* siscone/makefile.static:
	recursed make clean in the spherical dir

	* siscone/spherical/makefile.static:
	included main siscone header directory

	* siscone/siscone.cpp, siscone/spherical/siscone.cpp:
	The config.h header should be present from autoheader in the
	autotools build and from the sed command in the main
	makefile.static for build using the static makefiles.

	2009-05-29 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* configure.ac & NEWS:
	SISCone 2.0.1

	2009-05-28 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* Doxyfile (PROJECT_NUMBER):
	doc/html/*.html:
	switched the version number to 2.0.1

	* INSTALL (Notes):
	fixed the comment on the static/shared default build

	* configure.ac:
	enabled shared libs by defaut (following a long discussion
	regarding static vs. shared libraries, we finally decided to
	make a minimal modification compared to the previous release,
	i.e. keep shared libraries on)

	2009-05-25 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* configure.ac:
	switched back to static libraries

	* siscone/Makefile.am:
	examples/Makefile.am:
	siscone/spherical/Makefile.am:
	replace a few ${var} by $(var) to be more compatible
	with Makefile rules


	2009-05-01 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/spherical/hash.cpp (siscone_spherical):
	renamed _R into _radius (problem with some Mac systems).
	Note: some of the comments were mentioning R2 as a parameter
	rather than R, so this has been fixed at the same time.

	* configure.ac:
	build shared libs by default
	This is a bug-fix for FastJet that now uses shared libs by
	default too

	* configure.ac & Doxyfile:
	switched version number to 2.0.1-devel

	2009-04-17 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* NEWS & configure.ac:
	SISCone 2.0.0

	* doc/html/index.html:
	Doxyfile:
	configure.ac:
	switched the version number to 2.0.0

	2009-03-17 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/split_merge.cpp (siscone):
	moved the computation of the rapidity limits AFTER the
	exclusion of the particles with pz>=E


	2009-03-12 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* configure.ac:
	switched version to 2.0-devel

	* NEWS:
	updated to include the new things in the upcoming release

	* Doxyfile:
	updated together with an additional bunch of doxygen-compliant
	comments in the source files


	2008-08-06 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/siscone.cpp (siscone):
	make sure that the full 4-vector information is included in the
	protocones list.


	2008-07-29 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/siscone.cpp:
	siscone/spherical/siscone.cpp:
	check that the config.h file is available.
	Otherwise, use fixed values for PACKAGE and VERSION.


	2008-07-23 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/spherical/siscone.h (siscone_spherical):
	set E_tilde as the default SM variable.

	* siscone/spherical/split_merge.{h,cpp} (siscone_spherical):

	addressed the issue of IRC safety related to the choice of the
	split-merge ordering variable. We kept E (an unsafe choice) for
	its simplicity and added E_tilde defined as

	/ \|p_i X p_J\|^2 \
	\sum_{i\in J} E_i \| 1 + --------------- \|
	\ \|p_i\|^2 E_J^2 /

	The use of E_J instead of p_J in the denominator prevents the
	case where jets have zero momentum (e.g. monster jets with
	momentum conservation)

	Note that this variable is only used for the ordering; the
	computation of the overlap is always using the energy.


	2008-07-18 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/siscone.cpp (siscone)
	siscone/spherical/siscone.cpp (siscone_spherical):
	package_name() returns PACKAGE_NAME, not VERSION!

	* siscone/spherical/Makefile.am:
	added a path for siscone/config.h to be correctly included

	* siscone/Makefile.am:
	prevent config.h from being shipped with the distribution


	2008-07-07 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/spherical/split_merge.cpp (siscone_spherical):
	transformed the pt2 cut-off on particles into an
	energy (squared) cut-off.


	2008-07-07 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* Spherical version included in the main trunk
	(see below for details)

	* Copied the 'spherical branch' into the siscone/spherical
	folder.
	Copied the sample program into the example folder.
	Imported the ChangeLog from the branch

	Steps remaining in the main trunk: (. = todo, - = done)
	- updating the makefiles
	- deleted the "defines.h" file in the subdir
	the main one is used.
	- tested (make distcheck + sample running)

	Questions:
	- do we also copy the unchanged files? (It will mess a bit the
	filenames but they concerns material hidden to the end-user,
	so I'd keep them in the trunk
	It concerns circulator, reference, ranlux and siscone_error.
	- do we remove the quadtree in the spherical dir?
	(I'd say 'yes', not done currently)
	- keep the "unused" files in the branch? (area, quadtree, ...)


	2008-07-02 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* started the process of merging the spherical version of SISCone
	into the main trunk. The new version will be inserted in the
	"siscone/spherical" directory. We shall put it under the
	'siscone_spherical' namespace and rename the relevant classes
	using a 'CSph' prefic instead of the 'C' prefix used in the main
	trunk.
	Steps to be done in the branch: (. = todo, - = done)
	- move the relevant files in a 'siscone/spherical' directory
	- add a siscone/Makefile.am in the branch (+small updates)
	- change the namespace
	- rename the classes and update the names in the code
	Note that some of the classes have been kept from the main
	version (e.g. everything in reference.h, siscone_error.h +
	isolated classes like circulator, two_vector). This should
	not affect the end-user.
	- in the examples, move the main sample into a 'spherical' one
	- test on the branch
	DONE.

	2008-06-16 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/vicinity.cpp (siscone): revised the normalisation of the
	cocircular range.

	* siscone/split_merge.cpp (siscone): recomputed the norm of
	the result of a collinear merging. This is required as
	the norm is used in stable-cone search and not recomputed
	automatically.

	* siscone/protocones.cpp (siscone): normalised directions
	used to determine the angles. This might well be the reason
	of the co-circular problem.

	* siscone/geom_2d.cpp (siscone): removed an unused variable


	2008-06-14 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* Note: this version passed ~3e8 safety tests (including arcs,
	soft particles, reordering and single/multi-pass).

	* siscone/vicinity.cpp (siscone): added cocirc-tests
	WARNING: this is a naive adaptation from the cylindrical case.

	* siscone/momentum.h (siscone): reverted most of the last
	modification: since the simple computation using a cos()
	requires the computation of the norm (not its squared because
	the sign of the cos matters) it is most complicated than the one
	with the tangent. Note that we're free of the problem mentionned
	below as the only place where it can happen is in the
	computation of the vicinity and there we compute distances
	internally rather than calling is_closer.
	Finally, we've added a is_closer_safe with the computation
	using te cosine.

	2008-06-13 Gregory Soyez <gsoyez@quark.phy.bnl.gov>
	* siscone/vicinity.cpp (siscone):
	pre-added co-circularity management

	* siscone/momentum.h (siscone):
	replaced the tangent used in distances comparison by
	a cosine (the tangent is more precise at small R but
	we'll probably never get down to that small values of R).
	The reason for the replacement is that it gives wrong
	results for vicinity computation for 2R>pi/2.
	This present computation is also faster (no x-product).

	All calls to that function have been updated too.


	2008-06-12 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* Description: this is the first complete adaptation to the
	SISCone jet-search using spherical coordinatee.
	This branch is motivated by potential applications to
	cosmic-rays and follows a request by Yvonne Küssel
	<Yvonne.Kuessel@gmx.de>

	* Summary of modifications:
	- use the distance on a sphere instead of the eta-phi one This
	is the most important change and comes with
	modifications... well... ... everywhere. Most of the infos
	about the distance are in the momentum.{h,cpp} files. There
	are other important pieces when computing the candidate
	centres (in vicinity.cpp). And the theta_phi range (previously
	eta_phi!) in geom2d.cpp has also been relooked.
	- The spit--merge(SM) uses the energy instead of pttilde by
	default for the ordering
	- The final jets ae ordered in E instead of pt.
	- we don't remove particles with infinite rapidity (both in SC
	search and SM)
	- for the cone consistency tests, we use \|px\|+\|py\|+\|pz\| instead
	of \|px\|+\|py\|
	- we have removed the cut on soft particles in
	Csplit_merge::merge_collinear_and_remove_soft() since it was
	mainly used for area speed up.
	- Csplit_merge::use_pt_weighted_splitting is replaced by
	Csplit_merge::use_E_weighted_splitting when it is defined, the
	weight is of course 1/E^2 instead of 1/pt^2
	- To emphasise the fact that this is not the main SISCone trunk,
	we've added one sentence in the header of every file and a
	WARNING in the SISCone banner.

	* Still to be done
	- implement co-circularity (currently the range is set to 0)
	- in the split--merge, check the precision of the collinearity
	test?

	* Other points to think about
	- for the split of 2 protojets, we're currently making many
	calls to a full distance computation. This can surely be
	improved when no weighting is asked...
	- completely remove the quadtree?
	- remove the area support?
	- remove the Ctheta_phi range?
	or improve it (the cell initialisation assume a square shape,
	not a circle, but already with a square, the geometry is
	rather involved)

	* Final word: still need a whole bunch of tests (noticeably IRC
	safety, speed). Note that the stable-cone search has been
	checked "graphically".


	2008-05-20 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/hash.cpp (siscone):
	Adapted the size of the hash to scale like Nn(=N^2R^2) instead
	of N^2. This allows to save a fair amount of memory.


	2008-05-16 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* siscone/defines.h
	siscone/hash.{h,cpp} (siscone)
	siscone/protocones.{h,cpp} (siscone):
	siscone/siscone.{h,cpp} (siscone):
	add some debug information about the occupancy of the hash
	when DEBUG_STABLE_CONES is defined

	* examples/test.cpp: update the code to use Csiscone directly
	instead of separate calls to stable cone search and split--merge
	stage. This should be less confusing for end-users.

	2008-05-15 Gregory Soyez <gsoyez@quark.phy.bnl.gov>

	* configure.ac:
	in the last CXXFLAGS fix, the default has been set at a wrong
	place (practically, CXXFLAGS was set to the system default value
	-O2 -g and thus not replaced with our local default).
	This is fixed now.

	2008-03-24 Gregory Soyez <g.soyez@ulg.ac.be>

	* configure.ac:
	fix CXXFLAGS in such a way as to allow the user to set their own
	default.


	2008-03-17 Gregory Soyez <g.soyez@ulg.ac.be>

	* siscone/defines.h:
	siscone/siscone.h/cpp
	examples/option.cpp
	BUGS:
	Because of potentil conflicts with other packages, the
	tags defined in config.h are no longer included in
	defines.h but only in SISCone source files.
	As a practical consequence, the program name and version
	number are now accessed through siscone_package_name() and
	siscone_version() both defined in siscone.h and inside
	the siscone namespace. See examples/options.cpp for
	an example.
	This solves the corresponding bug reported by Seuster.


	2008-03-15 Gavin Salam <salam@lpthe.jussieu.fr>

	* BUGS:
	added entry related to PACKAGE/VERSION/etc reported by Seuster.

	2008-03-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* siscone/split_merge.h/cpp (siscone):

	This is a non-negligible modification: we have added the
	possibility to modify the way particles are split during the
	split-merge step.
	Assume one has to split protojets 1 and 2. The standard split
	associates a common particle j to the closest centre
	i.e. compares the distances D_{1j} vs. D_{2j}.
	Now, by calling Csplit_merge::set_pt_weighted_splitting(true),
	it is possible to perform the splitting according to the anti-kt
	distance i.e. comparing D_{1j}/k_{t1} vs. D_{2j}/k_{t2}.
	This new option should allow to produce more
	rigid (soft-resilient) jets.
	Note that the default is to use the standard distance comparison
	so backward compatibility is not broken.


	2008-03-11 Gregory Soyez <g.soyez@ulg.ac.be>

	* siscone/area.cpp (siscone):
	the jet+area finding now really returns the number of jets
	as does the standard clustering

	* siscone/area.cpp (siscone):
	don't include ghosts in stable-cone search when only the
	passive area is requested.
	This is a huge speed improvement as the execution time (when
	only passive area is requested) is now (with Ntot = N+Nghosts)
	O(N^2 log(N) + Ntot^2)
	instead of
	O(Ntot^2 log(Ntot) + Ntot^2)

	* configure.ac:
	switched the main trunk to SISCone-1.4.0-devel


	2008-03-07 Gavin SALAM <salam@lpthe.jussieu.fr>

	* configure.ac:
	switched version to 1.3.1

	2008-01-17 Gavin Salam <salam@lpthe.jussieu.fr>

	* configure.ac:
	switched version number over to 1.3.1-devel

	2008-01-15 Gregory Soyez <g.soyez@ulg.ac.be>

	* siscone/geom_2d.h (M_PI):
	added definition of M_PI if needed (VC compilation)

	* siscone/protocones.cpp (siscone):
	added the algorithm header (VC compilation)

	2007-11-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* NEWS & configure.ac:
	SISCone 1.3.0


	2007-11-10 Gavin Salam <salam@lpthe.jussieu.fr>

	* configure.ac:
	* examples/Makefile.am:
	* examples/events/Makefile.am:
	made sure some sample events were included in the dist

	2007-11-07 Gavin SALAM <salam@lpthe.jussieu.fr>

	* configure.ac:
	switched +="" to A=A"" to eliminate an error on mac

	2007-10-24 Gregory Soyez <g.soyez@ulg.ac.be>

	* examples/options.cpp: fix a missing "siscone/" in header include

	* examples/Makefile.am: fix a problem with make distcheck

	* configure.ac: the --enable-shared cmd-line option is already
	handled by libtool. We just need to add AM_DISABLE_SHARED to
	disable the shared lib by default (can still be changed by using
	--enable-shared)
	Also, we set the minimal version of autoconf to 2.57.

	* examples/Makefile.am: do not install anything (just build
	examples locally)

	* examples/main.cpp (main): print a more specific error message
	when the event file cannot be opened


	2007-10-03 Gregory Soyez <g.soyez@ulg.ac.be>

	* siscone/defines.h: read available information from config.h

	* In examples, include headers from the 'siscone' folder

	* Move the src folder into a new 'siscone' folder


	2007-10-02 Gregory Soyez <g.soyez@ulg.ac.be>

	* add configure script for the build process. This comes with a
	bunch of new files: autogen.sh, configure.ac, and a Makefile.am
	in each directory. See the INSTALL files for more details

	* replace each Makefile by makefile.static
	Makefile-based build is now made through
	make -f makefile.static

	* examples/area.cpp: add a sample program for SISCone jet area
	computation


	2007-06-24 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/defines.h: SISCone 1.2.0


	2007-06-15 Gregory Soyez <g.soyez@ulg.ac.be>


	* src/geom_2d.h/cpp: use a 32x32 eta-phi-plane tiling. The range
	is then defined by two binary fields. This allows easy overlap
	test and merging. For protojets splitting, the new ranges are
	built by adding particles one-by-one.

	* src/split_merge.cpp (siscone):
	- align code with the modifications in geom_2d.h/cpp
	- the output of save_contents has slightly been improved

	* src/area.h/cpp: add methods to compute only the active or passive
	area

	* examples/main.cpp: add pass-by-pass statistics in the verbose
	output

	* examples/options.cpp: fix bug when passing an unknown long
	option to getopt_long


	2007-06-02 Gregory Soyez <g.soyez@ulg.ac.be>

	* examples/sample.cpp: add a few lines to show how one can browse
	the output jets of compute_jets.

	* examples/times.cpp: only save runtime using the siscone class
	instead of a separate determination.

	2007-05-09 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	soft_pt2_cutoff -> stable_cone_soft_pt2_cutoff
	fixed infinite loop for non-zero stable_cone_soft_pt2_cutoff

	2007-05-09 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/split_merge.cpp\|h:
	When building the list of particles to be passed to stable-cone
	search, allow to remove particles below a pt2 threshold
	soft_pt2_cutoff.

	2007-04-27 Gavin SALAM <salam@lpthe.jussieu.fr>

	* src/geom_2d.cpp:
	corrected bugs in range_union -- now passes test that 1000
	events are identical to what we had previously.

	2007-04-26 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/split_merge.cpp (siscone): add range support to the
	split--merge. When computing overlap, we first check that the
	two ranges overlap. In splitting, ranges are set to the parent
	ranges. In merging, range is set as the union of the parent
	ranges.

	* src/split_merge.h: add a range variable to the Cjet class

	* src/geom_2d.cpp/h (siscone): add the Ceta_phi_range to handle
	covering ranges in the ete-phi plane. This goes with a function
	to test overlap and another to compute union.

	* src/momentum.h: Move geometry tools into geom_2d.h (new file)


	2007-04-24 Gavin SALAM <salam@lpthe.jussieu.fr> + Matteo

	* src/defines.h (VERSION):
	updated version number to 1.1.2-devel

	* src/split_merge.cpp (include):
	moved test on SM_var2_hardest_cut_off to beginning of loop, to
	ensure that we don't get a first jet that's below the cutoff.

	2007-04-20 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/split_merge.h: remove the "protected" attribute for
	'SM_var2_hardest_cut_off' for easier inclusion in fastjet. Note
	however that the 'protected' declaration in the previous version
	was used to prevent from dangerous usage of the variable. This
	is still applicable now!

	2007-04-18 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/area.cpp: Add a parameter '_hard_only' which allow to
	compute only the hard jets area (without the purely ghosted
	ones.

	* src/split_merge.h/cpp: Add a cut-off on the SM_var of the
	hardest protojet. This is useful for computation of the area of
	the hard jets without computing the purel ghosted ones. Note
	that this cut-off is colinear-unsafe so has to be used with
	great care.

	2007-04-13 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/area.cpp: add Carea, the class to compute jet area

	2007-03-16 Gregory Soyez <g.soyez@ulg.ac.be>

	* SISCone 1.1.1 (tags/siscone-1.1.1)

	2007-03-15 Gregory Soyez <g.soyez@ulg.ac.be>

	* doc/html/usage.html: update the html doc for the recent
	modifications of the split-merge algorithm.

	* src/split_merge.cpp: improve the recomputation method when two
	jets are very close in the ordering when SM var is set to SM_Et

	2007-03-15 Gavin SALAM <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	modified fix to multiple-pass bug, in hope of being minimally
	sensitive to rounding errors

	2007-03-15 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/siscone.h: set the default number of passes to 0

	* examples/main.cpp: adding two command line parameters to the
	siscone application:
	- npass controls the number of passes (0 by default)
	- sm controls the choice for the split--merge variable

	2007-03-14 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/momentum.h: add Et (inline) member function

	* src/siscone.h: remove backward-compatibility computation members to
	make things more clear.

	* src/split_merge.cpp:
	- fix multiple-pass bug
	- add Et SM variable management

	2007-03-14 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	put an assert for zero-size jets (common sign of a bug...);
	ensured that "recomputed" protocones (with full momentum) also
	have their eta-phi recalculated.

	2007-03-12 Gavin SALAM <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	added some more debugging output.

	2007-03-10 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	fixed some typos and a bug in the EPSILON_SPLITMERGE case for
	pt-tilde.

	2007-03-09 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/siscone.h: The default value for the SM variable is set to
	pttilde

	* src/split_merge.h/cpp: Update the split--merge procedure so that
	it takes into account the choice for the split--merge
	variable. Among the four choices, (pt_tilde, mt, pt and Et),
	pt_tilde is the default (mt and pt can lead to IR unsafety). Et
	is not yet implemented. We strongly advise to keep default value.

	2007-03-09 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/siscone.h\|cpp:
	* src/split_merge.h\|cpp:
	introduced an enum, Esplit_merge_scale (naming convention in
	analogy with the leading "C" for classes), which contains values
	SM_pt, SM_Et, SM_mt, SM_pttilde, and put in routines that take
	the enum (as well as leaving in old ones)

	2007-03-06 Gavin SALAM <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	added transverse mass to info printed out about protojets with
	the debug mode on (helpful in investigating limiting IR cases)

	2007-03-02 Gregory Soyez <g.soyez@ulg.ac.be>

	* SISCone 1.1.0 (tags/siscone-1.1.0)

	2007-03-02 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	transformed a quiet error on illegal f values into a throw.

	* src/siscone.cpp:
	throw an error on illegal R values.

	2007-03-01 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp\|h:
	added a new member variable, most_ambiguous_split, which records
	the degree of ambiguity of the most ambiguous decision about
	attributing a particle to one or other jet during a split step.
	Useful for testing purposes.

	2007-03-01 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/split_merge.cpp: set the full momentum
	information on stable cones when we add them
	to the protojet list

	* src/siscone.h,cpp: add comments concerning the
	split_merge_on_transverse_mass parameter

	* src/defines.h (VERSION): set to 1.1.0beta

	* src/split_merge.cpp (siscone):
	- set ptmin as a real pt cut-off (independent on the
	choice of variable for the SM)
	- code cleaned (involves other files e.g. defines.h
	momentum.h/cpp, siscone.h/cpp)

	* set the website to the HEPForge one in headers

	* replaced 'content' by 'contents' everywhere
	WARNING: it implies Cjet::contents and
	Csplit_merge::save_contents

	* src/quadtree.cpp (siscone): replace 'childs' with 'children'


	2007-02-21 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/protocones.cpp (siscone):
	- remove all functions that are no longer necessary and replace
	them by their new version. This includes the computatin of the
	cone content, its re-computation, the check for co-circularity
	and the test for stable cones in the co-circular situations.
	- add a few comments of potentially tricky points.
	- remove "cout" statements.
	- remove 'largest_cocircular_range' which is no longer used

	* src/vicinity.h:
	- "largest_cocircular_range" removed.
	- quadtree related stuff removed. As a consequence,
	'build_from_list' is renamed 'build'. The usage of the
	quadtree can now only be used in
	'Cstable_cone::proceed_with_stability' hence, the USE_QUADTREE
	define has been renamed USE_QUADTREE_FOR_STABILITY_TEST.
	- Comments aligned to make the code clearer.

	* src/momentum.h: Add mass() and mass2() member functions to
	Cmomentum().
	Put inline functions in the header rather than in the source
	file.

	* add C++ mark ("// -- C++ --") in the headers where it was
	missing

	2007-02-20 Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	enhanced check on infinite rapidities to include also
	meaningless rapidities.

	* src/split_merge.cpp\|h:
	* src/siscone.cpp:
	sorted out an issue on multi-pass runs caused by earlier fix for
	transverse mass ordering.

	2007-02-20 [am-pm] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/split_merge.cpp:
	fixed a bug that appeared once split_merge_on_transverse_mass
	got moved into the Csplit_merge_ptcomparison class

	* src/protocones.cpp\|h:
	introduced compute_cone_contents_nodist(), which calculates the
	initial cone contents by circulating around all in/out
	operations and collecting the net result --- this avoids any
	distance calculations and so removes a potential source of
	rounding error. (Any remaining rounding error is dealt with by
	cocircularity tests).

	* src/defines.h
	added more info about the meaning of the different EPSILON
	scales.

	2007-02-19 [evening] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/defines.h:
	introduced const bool split_merge_on_transverse_mass, which
	determines whether the split merge occurs on transverse mass
	instead of pt -- the latter turns out to be IR unsafe in
	mom-conserving events for moderately large values of R (R>1)

	* src/split_merge.cpp:
	implemented the split-merge ordering on transverse masses,
	including the limit of there being small differences.

	* src/momentum.h:
	introduced perpmass2() which returns the transverse mass,
	pt^2+m^2


	2007-02-19 [pm] Gavin Salam <salam@lpthe.jussieu.fr>

	NB: seg-faults are being seen sporadically when fastjet writes its
	description & need to be understood (but very rare and valgrind
	gives nothing on small numbers of events...)

	* src/defines.h:
	added optional #define EPSILON_SPLITMERGE, which if defined,
	sets a threshold for pt differences below which the ordering is
	determined from the explicit particle content...

	* src/split_merge.cpp\|h:
	trying to introduce more "exact" pt comparison in split merge to
	deal with multiple scales -- this involves a new
	Csplit_merge_ptcomparison class which allows the set to carry
	out comparisons while making use of knowledge about the particle
	momenta inside the split_merge class.

	* src/circulator.h:
	added != and == comparison operators.

	* src/protocones.h\|cpp:
	added Cstable_cones::test_cone_cocircular_p3() for carrying out
	a p^3 check of stability -- NB seems a bit slower for small p,
	but obviously much better for large p... Tests of 2*10^5
	particles show no errors, longer tests to be done later...

	2007-02-19 [am, early pm] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/vicinity.h\|cpp:
	introduced the Cvicinity_inclusion class to allow one to carry
	out checks both on the inclusion in the cone and in its
	"cocircular" border. Made corresponding changes elsewhere.

	* src/protocones.h\|cpp:
	wrote new_cocircular_check() and ran a certain number of tests
	on it; currently it is this one that is being called from
	update_cone(), but it still uses the original 2^p routine for
	actually checking the cone status.

	* src/[elsewhere]
	added a lot of (now commented) debugging statements to help fix
	bugs in the new_cocircular_check().

	2007-02-18 [pm - later] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/circulator.h: * ADDED *
	class for a circulator, used below.

	* src/protocones.(h\|cpp):
	wrote prepare_cocircular_lists(), and checked that it's working
	sensibly on some simple test events; also added code for
	esetablishing the largest cocircular range among the children of
	the current parent (should be used later to establish a more
	reliable in/out status).

	NB: the call to this function has added another 1-2% slowdown,
	and we're now about 3-4% slower than before starting this
	morning. But this should be the last of the changes that adds
	significant extra time use?

	* src/vicinity.(h\|cpp):
	support code for the protocones modification

	2007-02-18 [pm] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/defines.h:
	changed default EPSILON values to reflect what will be needed
	with the new approach.

	* src/vicinity.cpp:
	carried out the calculation of cocircular_range inside the
	append_to_vicinity member function; the extra
	calculations/storage etc lead to a 2-3% slow-down for the
	standard fastjet (354 particle) test event with R=1.

	* src/momentum.h:
	added a small 2-vector class, needed as a shorthand in
	vicinity.cpp, plus various small utility routines.

	* src/vicinity.h:
	introduced cocircular_range and cocircular (list) as members of
	Cvicinity_elm

	* src/momentum.h:
	introduced phi_in_range, dphi and abs_dphi inline functions.

	2007-02-18 [am] Gavin Salam <salam@lpthe.jussieu.fr>

	* src/vicinity.cpp (include):
	switched to twopi from defines.h instead of the pi2 class member

	* src/siscone_error.(cpp\|h): * ADDED *
	this is a simple class for throwing errors.

	* src/protocones.cpp:
	caused test_cone cocircular to throw errors when it receives
	more than 32 points

	carried out replacement client -> candidate

	* src/defines.h:
	introduced definition of twopi, which is used in many place (only
	some usage instances have been replaced for now).


	2007-02-16 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/defines.h: consider the limit on cocircularity and
	collinearity as different ones. This introduces the
	EPSILON_COCIRCULAR definition.

	* src/protocones.cpp (siscone):
	1. the list of cocircular situations already encountered is
	maintained with a pair of references (the cone contents and
	its border) instead of its coordinates.
	2. we have improved the recomputation of the cone contents by
	dynamically tracking he particles inside of the cone. This
	adds a list of included particles in Cvicinity as well as a
	pointer to elements of that list in vicinity elements.

	2007-02-15 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/protocones.cpp: Code has been restructured to clearly
	separate the cocircular case

	* dealt woth cocircularity and 2\pi periodicity and added
	an inline fction

	2007-02-14 Gregory Soyez <g.soyez@ulg.ac.be>

	* src/reference.cpp (siscone): ensures that the reference is not
	zero

	* src/protocones.cpp (siscone): Fix a bug with the interference
	between the recomputation of jets and the update of cocircular
	points

	* src/protocones.cpp (siscone): add tests for recomputation of the
	cone content for the case of cocircular points

	* src/protocones.cpp (siscone): when testing the threshold for
	recomputation of te cone content, we add a test putting
	automatically the cone to 0 when it is empty.

	2007-02-13 Gregory Soyez <g.soyez@ulg.ac.be>

	* We add a test of cocircularity: when more the p>2 particles are
	found on the same circle, we branch to a different test of cone
	stability. This new part of the algorithm tests all possible
	inclusions/exclusions of the particles along the circle in a
	2^p-type algorithm. Note that findling large values of p is
	highly improbable !

	2007-02-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* when traversing the centre list (in stable cones search), we
	start with the centre which is the most separated from its
	neighbours. This allows to minimize the possibility that we
	miscomputed the computation of the initial cone content due to
	possible rounding errors when two centres are too close.

	2007-02-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* in collinear merging, take care of the periodicity in phi

	* put the threshold for collinear merging in defines.h
	(EPSILON_COLLINEAR)

	2007-02-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* undo the previous modification and use another approach to deal
	with collinear particles: we keep the p_remain list as it was
	before (see revision 84). Instead, after computing p_remain, we
	compute p_uncol which is obtained from p_remain by merging
	collinear particles. In the siscone main loop, we then use
	p_uncol instead of p_remain for the search for stable
	cones. Note that with this modification, the 'parent_index'
	field of Cmomentum is back to its original definition as a
	'int'.

	2007-02-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* remove initialisation of parent_index in momentum.cpp and
	vicinity.cpp This is allowed because of the Npass loop in
	siscone. Indeed, parent_index is only used internally in
	split_merge and init at the very beginning of the loop by a call
	to init_pleft

	* replaced "int parent_index" by "vector<int> parent_index" and
	align the code in split_merge.cpp

	* add a few lines off code in split_merge.cpp to account for
	collinear particles.

	* Note concerning the previous update: the change has been
	validated and is no longer considered as temporary

	2007-02-12 Gregory Soyez <g.soyez@ulg.ac.be>

	* Changed the test for recomputation of cone content in Cstable_cones
	see defines.h for details
	(this change may be temporary)

	2007-02-10 Gregory Soyez <g.soyez@ulg.ac.be>

	* fixed doxygen documentation issues:
	- undocumented or renamed parameters
	- include various links into a custom html footer

	2007-01-25 Gregory Soyez <g.soyez@ulg.ac.be>

	* fixed memory leak for Cvicinity::ve_list
	in Cvicinity::set_particle_list()

	2007-01-23 Gavin SALAM <salam@lpthe.jussieu.fr>

	* added _ptmin argument to Csiscone::recompute_jets(...)

	2007-01-22 Gregory Soyez <g.soyez@ulg.ac.be>

	* add ptmin threshold on protojets during split-merge
	* modify example program to allow for the --ptmin option

	2007-01-20 Gregory Soyez <g.soyez@ulg.ac.be>

	* fix typo mistake in split_merge.cpp

	2007-01-18 Gregory Soyez <g.soyez@ulg.ac.be>

	* insert a header on top of each source files to give brief information
	about its content, the SISCone project and copyright

	2007-01-03 Gregory Soyez <g.soyez@ulg.ac.be>

	* remove the usage of the quadtree in stable cones detection.
	Usage of the quadtree in vicinity list creation and final stability
	tests can be switched on buy defining USE_QUADTREE in defines.h.
	This step was not fully achieved in the last update.

	2006-12-28 Gregory Soyez <g.soyez@ulg.ac.be>

	* remove the usage of the quadtree in stable cones detection.
	Usage of the quadtree in vicinity list creation and final stability
	tests can be switched on by defining USE_QUADTREE in defines.h

	2006-12-28 Gavin Salam <salam@lpthe.jussieu.fr>

	* commented out various "template std::vector<...>" lines to solve
	compilation problem on Macs.

	* modified the make depend targets so that they do not include
	"standard" include files (which differ from one system to
	another).

	* fixed log(_Np) bug pointed out by Matteo; fixed program name in
	defines.h

	2006-12-28 Gregory Soyez <g.soyez@ulg.ac.be>

	* replace variables with name being "underscore" followed by
	a single letter by longer names since they lead to compilation
	problems under Mac. In practice, we renamed _N with _Np in hash.cpp/h
	and _R by _radius in protocones.cpp/h and siscone.cpp/h

	2006-12-27 Gregory Soyez <g.soyez@ulg.ac.be>

	* arranged for "make dist" to create a file with the same version
	name in the directory and the tar file; made the tar-file
	read-only (to avoid involuntarily overwrite); removed svn file
	from the examples/events subdirectory.

	2006-12-26 Gregory Soyez <g.soyez@ulg.ac.be>

	* updated the 'dist' target in the Makefile: include mem_check
	with the correct path and build archive so that it unpacks into
	a siscone-1.0-beta directory

	* fix typos in INSTALL

	2006-12-26 Gavin Salam <salam@lpthe.jussieu.fr>

	* Changed banner so that first char is # (to allow the rest of the
	line to be considered a comment by things like gnuplot).

	* moved scones -> siscone (and sorted out various "ignores")

	* Reordered changelog so that later stuff appears first (I think
	this is standard? Makes it easier to see what's been happening
	recently...)

	* Tidying up: moved jets.gri and mem_check into the examples
	directory; added -f to "rm" command in make clean to avoid
	errors; modified siscones->siscone in a couple of places in
	doc.

	* Brought the README and INSTALL files up to date

	* set some svn:ignore property so as to ignore .dat files (to
	reduce "noise" with svn status).

	* added #!/bin/bash to head of examples/mem_check

	2006-12-22 Gregory Soyez <g.soyez@ulg.ac.be>

	* rename scones namespace into siscone

	* put ranlux stuff into the namespace (we don't want to
	pollute the gobal namespace

	* add doc/devel as directory for developer's documentation
	(using Doxygen)

	* scones.h/cpp is renamed siscone.h/cpp

	* creation of an 'examples' directory for various programs
	only the library libsiscone.a is left in the src dir
	Malefiles are modified accordingly


	2006-12-21 Gavin Salam <salam@lpthe.jussieu.fr>

	* added the MERGE_IDENTICAL_PROTOCONES_DEFAULT_TRUE define to
	allow one to make MERGE_IDENTICAL_PROTOCONES to be set true by
	default if need be. (This makes it a bit easier to make a quick
	modification to run a test).

	* changed some of the related comments

	* replaced occurrences of "extensive" with "multipass"

	* Added the ChangeLog file!


	2006-12-21 START OF CHANGELOG

	Index: trunk/siscone/geom_2d.h
	===================================================================
	--- trunk/siscone/geom_2d.h (revision 421)
	+++ trunk/siscone/geom_2d.h (revision 422)
	@@ -1,179 +1,179 @@
	// -- C++ --
	///////////////////////////////////////////////////////////////////////////////
	// File: geom_2d.h //
	// Description: header file for two-dimensional geometry tools //
	// This file is part of the SISCone project. //
	// For more details, see http://projects.hepforge.org/siscone //
	// //
	// Copyright (c) 2006 Gavin Salam and Gregory Soyez //
	// //
	// This program is free software; you can redistribute it and/or modify //
	// it under the terms of the GNU General Public License as published by //
	// the Free Software Foundation; either version 2 of the License, or //
	// (at your option) any later version. //
	// //
	// This program is distributed in the hope that it will be useful, //
	// but WITHOUT ANY WARRANTY; without even the implied warranty of //
	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
	// GNU General Public License for more details. //
	// //
	// You should have received a copy of the GNU General Public License //
	// along with this program; if not, write to the Free Software //
	// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
	// //
	// $Revision:: $//
	// $Date:: $//
	///////////////////////////////////////////////////////////////////////////////

	#ifndef __GEOM_2D_H__
	#define __GEOM_2D_H__

	#include <iostream>
	#include <math.h>
	#include "defines.h"

	#ifndef M_PI
	#define M_PI 3.141592653589793238462643383279502884197
	#endif

	namespace siscone{

	/// return a result that corresponds to phi, but in the
	/// range (-pi..pi]; the result is only correct if -3pi < phi <= 3pi
	inline double phi_in_range(double phi) {
	if (phi <= -M_PI) phi += twopi;
	else if (phi > M_PI) phi -= twopi;
	return phi;
	}

	/// return the difference between the two phi values,
	/// placed in the correct range (-pi..pi], , assuming that phi1,phi2
	/// are already in the correct range.
	inline double dphi(double phi1, double phi2) {
	return phi_in_range(phi1-phi2);
	}


	/// return the absolute difference between the two phi values,
	/// placed in the correct range, assuming that phi1,phi2 are already
	/// in the correct range.
	inline double abs_dphi(double phi1, double phi2) {
	double delta = fabs(phi1-phi2);
	return delta > M_PI ? twopi-delta : delta;
	}

	/// return the square of the argument
	inline double pow2(double x) {return x*x;}


	/**
	* \class Ctwovect
	* \brief class for holding a two-vector
	*/
	class Ctwovect {
	public:
	/// default ctor
	Ctwovect() : x(0.0), y(0.0) {}

	/// ctor with initialisation
	/// \param _x first coordinate
	/// \param _y second coordinate
	Ctwovect(double _x, double _y) : x(_x), y(_y) {}

	/// vector coordinates
	double x, y;

	/// norm (modulud square) of the vector
	inline double mod2() const {return pow2(x)+pow2(y);}

	/// modulus of the vector
	inline double modulus() const {return sqrt(mod2());}
	};


	/// dot product of two 2-vectors
	/// \param a first 2-vect
	/// \param b second 2-vect
	/// \return a.b is returned
	inline double dot_product(const Ctwovect & a, const Ctwovect & b) {
	return a.xb.x + a.yb.y;
	}


	/// cross product of two 2-vectors
	/// \param a first 2-vect
	/// \param b second 2-vect
	/// \return a x b is returned
	inline double cross_product(const Ctwovect & a, const Ctwovect & b) {
	return a.xb.y - a.yb.x;
	}


	/**
	* \class Ceta_phi_range
	* \brief class for holding a covering range in eta-phi
	*
	* This class deals with ranges in the eta-phi plane. It
	* implements methods to test if two ranges overlap and
	* to take the union of two overlapping intervals.
	*/
	class Ceta_phi_range{
	public:
	/// default ctor
	Ceta_phi_range();

	/// ctor with initialisation
	/// we initialise with a centre (in eta,phi) and a radius
	/// \param c_eta eta coordinate of the centre
	/// \param c_phi phi coordinate of the centre
	/// \param R radius
	Ceta_phi_range(double c_eta, double c_phi, double R);

	/// assignment of range
	/// \param r range to assign to current one
	Ceta_phi_range& operator = (const Ceta_phi_range &r);

	/// add a particle to the range
	/// \param eta eta coordinate of the particle
	/// \param phi phi coordinate of the particle
	/// \return 0 on success, 1 on error
	int add_particle(const double eta, const double phi);

	/// eta range as a binary coding of covered cells
	unsigned int eta_range;

	/// phi range as a binary coding of covered cells
	unsigned int phi_range;

	// extremal value for eta
	static double eta_min; ///< minimal value for eta
	static double eta_max; ///< maximal value for eta

	private:
	/// return the cell index corrsponding to an eta value
	inline unsigned int get_eta_cell(double eta){
	- return (unsigned int) (1 << ((int) (32*((eta-eta_min)/(eta_max-eta_min)))));
	+ return (unsigned int) (1u << ((int) (32*((eta-eta_min)/(eta_max-eta_min)))));
	}

	/// return the cell index corrsponding to a phi value
	inline unsigned int get_phi_cell(double phi){
	- return (unsigned int) (1 << ((int) (32*phi/twopi+16)%32));
	+ return (unsigned int) (1u << ((int) (32*phi/twopi+16)%32));
	}
	};

	/// test overlap
	/// \param r1 first range
	/// \param r2 second range
	/// \return true if overlap, false otherwise.
	bool is_range_overlap(const Ceta_phi_range &r1, const Ceta_phi_range &r2);

	/// compute union
	/// Note: we assume that the two intervals overlap
	/// \param r1 first range
	/// \param r2 second range
	/// \return union of the two ranges
	const Ceta_phi_range range_union(const Ceta_phi_range &r1, const Ceta_phi_range &r2);

	}

	#endif
	Index: trunk/siscone/spherical/geom_2d.h
	===================================================================
	--- trunk/siscone/spherical/geom_2d.h (revision 421)
	+++ trunk/siscone/spherical/geom_2d.h (revision 422)
	@@ -1,112 +1,112 @@
	// -- C++ --
	///////////////////////////////////////////////////////////////////////////////
	// File: geom_2d.h //
	// Description: header file for two-dimensional geometry tools //
	// This file is part of the SISCone project. //
	// WARNING: this is not the main SISCone trunk but //
	// an adaptation to spherical coordinates //
	// For more details, see http://projects.hepforge.org/siscone //
	// //
	// Copyright (c) 2006-2008 Gavin Salam and Gregory Soyez //
	// //
	// This program is free software; you can redistribute it and/or modify //
	// it under the terms of the GNU General Public License as published by //
	// the Free Software Foundation; either version 2 of the License, or //
	// (at your option) any later version. //
	// //
	// This program is distributed in the hope that it will be useful, //
	// but WITHOUT ANY WARRANTY; without even the implied warranty of //
	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
	// GNU General Public License for more details. //
	// //
	// You should have received a copy of the GNU General Public License //
	// along with this program; if not, write to the Free Software //
	// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA //
	// //
	// $Revision:: $//
	// $Date:: $//
	///////////////////////////////////////////////////////////////////////////////

	#ifndef __SPH_GEOM_2D_H__
	#define __SPH_GEOM_2D_H__

	#include <iostream>
	#include <math.h>
	#include <siscone/defines.h>
	#include <siscone/geom_2d.h>

	#ifndef M_PI
	#define M_PI 3.141592653589793238462643383279502884197
	#endif

	namespace siscone_spherical{

	/**
	* \class CSphtheta_phi_range
	* \brief class for holding a covering range in eta-phi
	*
	* This class deals with ranges in the eta-phi plane. It
	* implements methods to test if two ranges overlap and
	* to take the union of two overlapping intervals.
	*/
	class CSphtheta_phi_range{
	public:
	/// default ctor
	CSphtheta_phi_range();

	/// ctor with initialisation
	/// we initialise with a centre (in theta,phi) and a radius
	/// \param c_theta theta coordinate of the centre
	/// \param c_phi phi coordinate of the centre
	/// \param R radius
	CSphtheta_phi_range(double c_theta, double c_phi, double R);

	/// assignment of range
	/// \param r range to assign to current one
	CSphtheta_phi_range& operator = (const CSphtheta_phi_range &r);

	/// add a particle to the range
	/// \param theta theta coordinate of the particle
	/// \param phi phi coordinate of the particle
	/// \return 0 on success, 1 on error
	int add_particle(const double theta, const double phi);

	/// theta range as a binary coding of covered cells
	unsigned int theta_range;

	/// phi range as a binary coding of covered cells
	unsigned int phi_range;

	/// extremal value for theta
	static double theta_min; ///< minimal value for theta (set to 0)
	static double theta_max; ///< maximal value for theta (set to pi)

	private:
	/// return the cell index corrsponding to a theta value
	inline unsigned int get_theta_cell(double theta){
	- if (theta>=theta_max) return 1<<31;
	- return (unsigned int) (1 << ((int) (32*((theta-theta_min)/(theta_max-theta_min)))));
	+ if (theta>=theta_max) return 1u<<31;
	+ return (unsigned int) (1u << ((int) (32*((theta-theta_min)/(theta_max-theta_min)))));
	}

	/// return the cell index corrsponding to a phi value
	inline unsigned int get_phi_cell(double phi){
	- return (unsigned int) (1 << ((int) (32*phi/twopi+16)%32));
	+ return (unsigned int) (1u << ((int) (32*phi/twopi+16)%32));
	}
	};

	/// test overlap
	/// \param r1 first range
	/// \param r2 second range
	/// \return true if overlap, false otherwise.
	bool is_range_overlap(const CSphtheta_phi_range &r1, const CSphtheta_phi_range &r2);

	/// compute union
	/// Note: we assume that the two intervals overlap
	/// \param r1 first range
	/// \param r2 second range
	/// \return union of the two ranges
	const CSphtheta_phi_range range_union(const CSphtheta_phi_range &r1, const CSphtheta_phi_range &r2);

	}

	#endif
	Index: trunk/NEWS
	===================================================================
	--- trunk/NEWS (revision 421)
	+++ trunk/NEWS (revision 422)
	@@ -1,211 +1,217 @@
	This file contains the history of SISCone releases. For each one,
	we give a short summary of the important changes from the previous
	version. If you want to see a more detailed list of changes, please
	read the ChangeLog file.

	+SISCone version 3.0.5 (April 22 2020)
	+=====================
	+
	+* Minor release, fixed sign/unsigend warning in bitshift operation
	+ (version to be included in FastJet>=3.3.4)
	+
	SISCone version 3.0.4 (October 1 2018)
	=====================

	* Minor release, improved shared library handling by fixing
	inter-dependences. (version to be included in FastJet>=3.3.2)

	SISCone version 3.0.3 (August 3 2016)
	=====================

	* Minor release, installing config.h to include flags decided at
	configure time. (version to be included in FastJet>=3.2.1)

	SISCone version 3.0.2 (March 16 2016)
	=====================

	* Minor release, fixing a bug due to an array being used uninitialised
	(no impact on results). Also replaced auto_ptr by unique_ptr when
	supported by compiler (version to be included in FastJet>=3.2.0)

	SISCone version 3.0.1 (February 29 2016)
	=====================

	* Minor release, fixing a bug due to a rounding issue that occurs the
	theta range in (rare) specific configurations where theta=pi in the
	split-merge procedure for spherical SISCone

	SISCone version 3.0.0 (September 9 2014)
	=====================

	* Added the option of running SISCone with progressive removal,
	corresponding to the following algorithm:

	1. search for stable cones
	2. declare the hardest stable cone a jet and remove its particles
	from the list of remaining particles
	3. if there are some remaining particles, go back to 1.

	Use Csiscone::compute_jets_progressive_removal(...) for this version
	of SISCone

	The scale used to determine which is the hardest stable cone can be
	chosen amongst the same options as the scale used for the
	split--merge step [SM_pttilde by default for the pp version of
	SISCone, SM_Etilde for the spherical version]. Alternatively, a
	user-defined scale choice can be provided using set_user_scale(...).

	Version to be included in FastJet>=3.1.0

	SISCone version 2.0.6 (April 9 2013)
	=====================
	* Minor release fixing an issue concerning the installation of
	configuration headers and bringing small updates in the autotools
	build system (version to be included in FastJet>=3.0.4)

	SISCone version 2.0.5 (January 17 2012)
	=====================
	* Minor release bringing minor improvements to the build system
	(version to be included in FastJet>=3.0.2)

	SISCone version 2.0.4 (November 25 2011)
	=====================
	* Minor release to remove a few gcc warnings when compiled with
	high warning level (-ansi -pedantic -Wextra -Wshadow)
	(version to be included in FastJet>=3.0.1)

	SISCone version 2.0.3 (October 5 2011)
	=====================
	* Minor release to fix a badly documented Etilde variable in the
	spherical version of SISCone and to remove a few gcc warnings
	(version to be included in FastJet 3.x)

	SISCone version 2.0.2 (May 2011)
	=====================
	* minor modifications to the build system
	(version to be included in FastJet 3.x)

	SISCone version 2.0.1 (May 2009)
	=====================
	* enabled shared libraries by default
	[that was the source of a bug in fastJet]
	* replaced _R with _radius to fix build problems on old OSX systems
	* fixed some syntax inconsistencies in Makefile.am's


	SISCone version 2.0.0 (Apr 2009)
	=====================
	* Added a spherical version of SISCone for use in e+e- collisions
	This typically works in the same way as the pp version of SISCone
	with the following remarks:
	- the classes fot the spherical versions of SISCone are prefixed by
	'CSph' instead of 'C' (e.g. CSphMomentum CSphSISCone)
	- the cone radius is defined as its half opening angle (particle
	distances are also defined through the angle they define, or,
	equivalently, as distances on the surface of a unit sphere)
	- For ordering the protojets during the split--merge, we use
	E_tilde defined as
	/ \|p_i X p_J\|^2 \
	\sum_{i\in J} E_i \| 1 + --------------- \|
	\ \|p_i\|^2 E_J^2 /
	Note that the computation of the overlap uses the "plain" energy

	* Added a flag (Csiscone::use_pt_weighted_splitting) to modify the
	split part of the split-merge procedure in such a way that a shared
	particle i is assigned the one of the overlapping jets j=1,2 that
	has the smaller value of DeltaR_{ij}/p_{tj}. This produces more
	circular jets.

	* fixed a bug in the computation of the rapidity range in the
	split-merge step

	* the protocones list now contains the full 4-momentum information
	(rather than just eta and phi)

	* fixed bugs in example/test.cpp


	SISCone version 1.3.3 (Aug 2008)
	=====================
	* added bugfix for g++-4.3 (missing headers for "exit")


	SISCone version 1.3.2 (Mar 2008)
	=====================
	* VERSION and PROGRAM (or PACKAGE_NAME) are no longer accessible
	directly because of potential conflicts with other packages.
	You should use siscone_version() and siscone_package_name()
	instead. (Thanks to Rolf Seuster)
	* allow the users to set their own default compilation flags.


	SISCone version 1.3.1 (Mar 2008)
	=====================
	* fixed some compilation issues under windows


	SISCone version 1.3.0 (Nov 2007)
	=====================

	* The main update in this new release is the switch to
	'autotools'. This means that instead of using the (static) Makefile
	build process, you can now use the "standard ./configure; make; make
	install" approach. See the INSTALL file for details.

	* added a 'siscone_area' example of how jet areas work within SISCone.


	SISCone version 1.2.0 (Jun 2007)
	=====================

	* 10-15% speed increase by introducing a tiling in the eta-phi plane
	allowing for better overlap checking in the split--merge. This can
	turn into a bigger effect for area computations.

	* implementing a 'jet area' class to compute active and/or passive
	areas.

	* in examples:
	- fix bug in the cmdline parsing (there was a segfault with
	unrecognised long options),
	- add "passes information" to the verbose output of the main siscone
	program,
	- solve problems with the 'time' example.


	SISCone version 1.1.1 (Mar 2007)
	=====================

	* The major upgrade is the use of pttilde (p-scheme pt) instead
	of mt in the split--merge process. Indeed, we have noticed
	that mt can lead to IR usafety in the case of two back-to-back
	narrow-decay-width unstable particles (e.g. a pair of Higgs bosons).
	See http://projects.hepforge.org/siscone/sm_issue.html for details.

	Note that SISCone 1.1.1 allows the user to specify its choice for
	the split-merge variable (we highly recommand the default choice)

	* The number of passes is now set to infinity (0) by default

	* Small minor changes in the 'siscone' command-line options


	SISCone version 1.1.0 (Mar 2007)
	=====================

	* dealt with colinearity issues

	* dealt with cocircularity situations (and related rounding errors)

	* use mt instead of pt in the split-merge
	pt lead to some IR unsafety for events with momentum conservation

	* move all references to HEPForge

	* Important note: some typos have been fixed. As a consequence, some
	end-user members have been affected:
	- The contents of the jets is accessed through 'Cjet::contents'
	instead of 'Cjet::content'
	- The function called to save the jet contents to disk is
	'Csplit_merge::save_contents' instead of 'Csplit_merge::save_content'
	Note that 'Csiscone::save_contents' is also valid.


	SISCone version 1.0.0 (Jan 2007)
	=====================

	This is the first stable release of siscone.

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