Here is the definition of positive difference that works:
PosDiff =: 4 : '(x >. y) - (x <. y)' I tried to create a version which is a fork, but it is returning 0 0 instead of differencing them: PosDiff =: (] >. [) - (] <. [) PosDiff 4 3 0 0 PosDiff 3 4 0 0 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
