distance_deriv.hh File Reference

inline function for computing f1/f2 derivatives for a function of an angle More...

#include <numeric/xyzVector.hh>

Namespaces
	numeric
	Unit headers.
	numeric::deriv

Functions
template<class P >
void	numeric::deriv::distance_f1_f2_deriv (xyzVector< P > const &p1, xyzVector< P > const &p2, P &distance, xyzVector< P > &f1, xyzVector< P > &f2)
	Compute the f1/f2 derivative vectors for point p1 for a function F of the distance between p1 and p2. This function returns the distance which should be used to evaluate dF_ddist. dF_ddist should then be multiplied into both f1 and f2. The values of the output variables f1 and f2 are overwritten. More...

Detailed Description

inline function for computing f1/f2 derivatives for a function of an angle

Author

Phil Bradley did all the hard work deriving the math represented here.

Andrew Leaver-Fay copy-and-pasted Phil's code into this file from the AngleConstraint.cc file for general use.