int **array1 = malloc(nrows * sizeof(int *));
for(i = 0; i < nrows; i++)
	array1[i] = malloc(ncolumns * sizeof(int));


double ** mat;
mymat = malloc(sizeof( *mymat) * n);
for (i=0; i<n; i++)
	{
	mymat[i]=malloc(sizeof(**mymat) * n);
	}