On J602, _. <: _ gives 0. On 601 it gave 1. This is not a bug but it caused me a few minutes' debugging & might be mentioned for others.
It's not a bug because the behavior of _. is undefined. But in a way, it is a J problem because working old code breaks in the new release. Just thinking... I try never to have _. in my data, but it's hard to be sure. How hard would it be to have a debug setting that gives a domain error if _. is ever produced? Then I would know that I would be immune from a problem like this. Henry Rich ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
