Hi all, Say I have a 2D array A(nx, ny). In each A[i, j] I want to compute convolve(a, kernel) where a is subarray of A. a and kernel are small besides A. The problem is that nx & ny are quite "big", ie ~1000, so using a loop on i & j is forbidden here. So how can I do what I want? Any idea? TIA. Cheers, -- Fred