freegs.multigrid.restrict

freegs.multigrid.restrict(orig, out=None, avg=False)

Coarsen the original onto a coarser mesh

Inputs

orig[nx,ny] - A 2D numpy array. Each dimension must have

a size (2^n + 1) though nx != ny is possible

returns:

A 2D numpy array of size [(nx-1)/2+1, (ny-1)/2+1]

rtype:

numpy.ndarray