clebsch_gordan_coeff.h

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#ifndef CLEBSCH_GORDAN_H
#define CLEBSCH_GORDAN_H
 
#include "source_base/intarray.h"
#include "source_base/matrix.h"
#include "source_base/realarray.h"
#include "source_base/vector3.h"
 
namespace ModuleBase
{
 
class Clebsch_Gordan
{
  public:
    Clebsch_Gordan();
    ~Clebsch_Gordan();
 
    static void clebsch_gordan(const int& lli,
                               ModuleBase::realArray& ap,
                               ModuleBase::IntArray& lpx,
                               ModuleBase::IntArray& lpl);
 
  private:
    static void gen_rndm_r(const int& llx, ModuleBase::Vector3<double>* r);
 
    static double compute_ap(const int& L,
                             const int& li,
                             const int& lj,
                             const int& llx,
                             const ModuleBase::matrix& ylm,
                             const ModuleBase::matrix& mly);
};
 
} // namespace ModuleBase
 
#endif // CLEBSCH_GORDAN_H