routines_cartesian.h

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namespace Numerics{
  template <class Shortcuts>
  inline void get_normals(const double* Q, int direction, double& norm, double* n){
    norm = 1;
    n[0] = 0;
    n[1] = 0;
    n[2] = 0;   
    n[direction] = 1;
  }
}