Thank you both for the replies. I never knew &.> would perform 'each' of the left arguments to the right argument :
(i.10) |. &.> < 0 0 1 0 0 NB. Rotates the boxed right argument, using each of the left arguments (i.10) I thought it only worked "the other way around" : 1 |. &.> 0 0 1 0 0; 0 0 0 0 1 NB. Rotates each of the boxed right arguments, by the left argument ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
