I have a matrix S of n vectors, s0, s1, s2 etc and a verb u with which I can build a matrix T of n vectors, t0, t1, t2 etc by the following procedure:
t0=: s0 t1=: s1 u t0 t2=: s2 u t1 etc T=: u/@:|.\S will do it, but will the interpreter recognize the quick way of doing u/@:|.\ (for any verb u)? The problem I have described is very common in engineering. I've always used a loop before and am now aiming for something tidier. But will it be efficient? Regards Graham ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
