The first train I used has been given by Chris: getting the shape and the value (in a console, when you don't have a fancy GUI à la Dyalog).
($;]) a ┌─┬─┐ │1│0│ └─┴─┘ But, Daniel, have you looked at the Phrases? You'll find hundreds of them classified by application type in about fifty categories and probably all written by Roger. http://www.jsoftware.com/help/phrases/contents.htm Enough? ~ Gilles ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm