Pascal, I don't understand your second example at all. I finally understand the first example after noticing the following result, I realize the result of keyD produces the indices of adg,bf,ce in abcdefg.
1 2 3 1 3 2 1 </. 'abcdefg' +---+--+--+ |adg|bf|ce| +---+--+--+ But what is going on in the second example. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
