### csclip -- Reduce to a submatrix

        call a%csclip(b,info[,&
           & imin,imax,jmin,jmax,rscale,cscale])

Returns the submatrix `A(imin:imax,jmin:jmax)`, optionally rescaling row/col indices to the range `1:imax-imin+1,1:jmax-jmin+1`.

Type:
  Asynchronous.
On Entry
a
  the sparse matrix.
  A variable of type `psb_Tspmat_type`.
  Scope: local.
imin,imax,jmin,jmax
  Minimum and maximum row and column indices.
  Type: optional.
rscale,cscale
  Whether to rescale row/column indices. Type: optional.

On Return
b
  A copy of a submatrix of `a`.
  A variable of type `psb_Tspmat_type`.
info
  Return code.