OK, here is a simplified example of what I'm trying to do: I want to split a matrix into two, so that the result is composed of the odd rows and even rows of the matrix respectively
e.g. oddevenrows i. 6 0 1 2 6 7 8 12 13 14 3 4 5 9 10 11 15 16 17 I'm thinking, should I use select or cut or something else. Long day. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm