mdp_topologies.h

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// //////////////////////////////////////////////////////
// Basic topologies:
// //////////////////////////////////////////////////////

void torus_topology(int mu, 
                    int *x_dw, 
                    int *x, 
                    int *x_up, 
                    int ndim, 
                    int *nx) {
  for(int nu=0; nu<ndim; nu++) if(nu==mu) {
    x_dw[mu]=(x[mu]-1+nx[mu]) % nx[mu];
    x_up[mu]=(x[mu]+1) % nx[mu];
  } else x_up[nu]=x_dw[nu]=x[nu];
}

void box_topology(int mu, 
                  int *x_dw, 
                  int *x, 
                  int *x_up, 
                  int ndim, 
                  int *nx) { 
  torus_topology(mu,x_dw,x,x_up,ndim,nx);
  if(x[mu]==0)        x_dw[mu]=x[mu];
  if(x[mu]==nx[mu]-1) x_up[mu]=x[mu];
} 

void moebious_topolgy(int mu, 
                      int *x_dw, 
                      int *x, 
                      int *x_up, 
                      int ndim, 
                      int *nx) {
  torus_topology(mu,x_dw,x,x_up,ndim,nx);
  if(mu==0) {
    if(x[0]==0)       x_dw[1]=nx[1]-x[1]-1;
    if(x[0]==nx[0]-1) x_up[1]=nx[1]-x[1]-1;
  }
}

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