Running the latest beta I have found a couple of places where I was generating _. . The new 'NaN error' popped them right up, which is great.
They turned out to be forms like _ % _ . Of course each application needs to decide what the result should be in this invalid case; but if 0 is an acceptable result, as it was for me, the quick fix was to replace % with (*%) . Henry Rich ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
