/usr/include/CLHEP/GenericFunctions/AssociatedLegendre.icc is in libclhep-dev 2.1.4.1+dfsg-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 | // -*- C++ -*-
// $Id:
#include "CLHEP/GenericFunctions/Variable.hh"
#include "CLHEP/GenericFunctions/Power.hh"
#include <gsl/gsl_sf_legendre.h>
#include <cmath>
#include <signal.h>
#include <assert.h>
namespace Genfun {
FUNCTION_OBJECT_IMP(AssociatedLegendre)
// This is the product n (n-2) (n-4)...
inline double dfactorial (int n) {
if (n<=1) return 1.0;
else return n*dfactorial(n-2);
}
//
inline
AssociatedLegendre::AssociatedLegendre(unsigned int l, unsigned int m):
AbsFunction(),
_l(l),
_m(m)
{
assert(m<=l);
}
inline
AssociatedLegendre::~AssociatedLegendre() {
}
inline
AssociatedLegendre::AssociatedLegendre(const AssociatedLegendre & right):
AbsFunction(),
_l(right._l),
_m(right._m)
{
}
inline
unsigned int AssociatedLegendre::l() const {
return _l;
}
inline
unsigned int AssociatedLegendre::m() const {
return _m;
}
inline
double AssociatedLegendre::operator() (double x) const {
gsl_sf_result result;
int status = gsl_sf_legendre_Plm_e (_l, _m, x, &result);
if (status!=0) {
std::cerr << "Warning, GSL function gsl_sf_bessel_Yn_impl"
<< " return code" << status << std::endl;
raise(SIGFPE);
}
return result.val;
}
} // end namespace Genfun
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