The 3!:6 thread got me thinking about obfuscated J.
So, here's a challenge for the true J packrat. Provide a u and y for which:
u^:_1 (y)
produces a result, but:
u^:_1: (y)
signals an error. For bonus dyed-in-the-wool points, cite the exact
documentation that "supports" this behavior.
-Dan---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
