#include <blitz/array.h>#include <blitz/array/stencil-et.h>using namespace blitz;int main(){    Array<float,2> A(Range(-7,7),Range(-7,7)), B(Range(-7,7),Range(-7,7));    A = 0.0;    A(0,0) = 1;    B = 0.0;    Range I(-5,5), J(-5,5);    Array<float,2> Ai = A(I,J), Bi = B(I,J);    Bi = Laplacian2D4n(Ai) * 0.1;    cout << Bi << endl;}