C implementation of the loop

Let us write the gridloop1 and gridloop2 functions in C
Typical C code: 
void gridloop1(double** a, double* xcoor, double* ycoor, 
               int nx, int ny, Fxy func1)
{
  int i, j;
  for (i=0; i<nx; i++) {
    for (j=0; j<ny; j++) {
       a[i][j] = func1(xcoor[i], ycoor[j])
}
Problem: NumPy arrays use single pointers to data
The above function represents a as a double pointer (common in C for two-dimensional arrays)

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