Dear all, I'm but a layman so do not take offence at this maybe over simple question.
This is something which is done often in FEM methods, and the alike. I have matrix A of 3x3 elements, and B, of the same number of elements, 3x3. What would be the most obvious way to assemble a matrix which: a11 a12 a13 a21 a22 a23 a31 a32 a33+b11 b12 b13 b21 b22 b23 b31 b32 b33 (the missing elements = zero) (you see the pattern - if there was a third matrix C, it would "connect" to b33 on the main diagonal) Matjaz -- http://mail.python.org/mailman/listinfo/python-list