JacobianCurvilinearToCartesian.h
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JacobianCurvilinearToCartesian.h
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	#ifndef JacobianCurvilinearToCartesian_H
	#define JacobianCurvilinearToCartesian_H

	#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"

	class GlobalTrajectoryParameters;

	/** Class which calculates the Jacobian matrix of the transformation
	* from the curvilinear to the Cartesian frame. The Jacobian is calculated
	* during construction and thereafter cached, enabling reuse of the same
	* Jacobian without calculating it again.
	*/

	class JacobianCurvilinearToCartesian {

	public:

	/** Constructor from global trajectory parameters. NB!! No default constructor exists!
	*/

	JacobianCurvilinearToCartesian(const GlobalTrajectoryParameters& globalParameters);

	/** Access to Jacobian.
	*/

	const AlgebraicMatrix65& jacobian() const;
	const AlgebraicMatrix jacobian_old() const;


	private:

	AlgebraicMatrix65 theJacobian;

	};

	#endif //JacobianCurvilinearToCartesian_H