b = del2(s) : computes the Discrete Laplacian of iFunc object @iFunc/del2 function to compute the Discrete Laplacian of models. input: s: object or array (iFunc) output: b: object or array (iFunc) ex: b=del2(a); Version: Aug. 22, 2017 See also iFunc, iFunc/gradient, del2, gradient, iFunc/jacobian