/usr/include/CLHEP/GenericFunctions/SphericalNeumann.icc is in libclhep-dev 2.1.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | // -*- C++ -*-
// $Id: SphericalNeumann.icc,v 1.4 2010/06/16 18:22:01 garren Exp $
#include "CLHEP/GenericFunctions/Sin.hh"
#include "CLHEP/GenericFunctions/Cos.hh"
#include "CLHEP/GenericFunctions/Variable.hh"
#include "gsl/gsl_sf_bessel.h"
#include <signal.h>
namespace Genfun {
FUNCTION_OBJECT_IMP(SphericalNeumann)
//----------------------------------------------------------------------------------//
// Implementation notes: The Spherical Neumann function is implemented in terms of //
// lower order spherical neumann functions. This is possible thanks to a recursion //
// relation. //
//----------------------------------------------------------------------------------//
inline
SphericalNeumann::SphericalNeumann(unsigned int l):
_l(l)
{
create();
}
inline
SphericalNeumann::~SphericalNeumann() {
delete _function;
}
inline
SphericalNeumann::SphericalNeumann(const SphericalNeumann & right):
_l(right._l)
{
create();
}
inline
double SphericalNeumann::operator() (double x) const {
//
// First try the GSL implementation:
//
gsl_sf_result result;
int status =gsl_sf_bessel_yl_e(_l, x,&result);
if (status!=0) {
std::cerr << "Warning, GSL function gsl_sf_bessel_yl_impl"
<< " return code" << status << std::endl;
raise(SIGFPE);
}
return result.val;
//return (*_function)(x);
}
inline
unsigned int SphericalNeumann::l() const {
return _l;
}
inline
void SphericalNeumann::create() {
Sin sine;
Cos cosine;
Variable x;
if (_l==0) {
_function = (-cosine/x).clone();
}
else if (_l==1) {
_function = (-cosine/x/x - sine/x).clone();
}
else {
SphericalNeumann j_minus(_l-1);
SphericalNeumann j_minus_minus(_l-2);
_function = ((2*_l-1)*j_minus/x - j_minus_minus).clone();;
}
}
} // end of namespace Genfun
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