DELSQ

 

 Construct five-point finite difference Laplacian.

  delsq(G) is the sparse form of the two-dimensional,

  5-point discrete negative Laplacian on the grid G.

  The grid G can be generated by NUMGRID859C38 or NESTED18IKXSW.

 

 

  See also NUMGRID859C38, DEL216NX1U2, DELSQDEMO70MY0PU.