4$.s is not invertible.
----- Original Message ----- From: ramacd <[EMAIL PROTECTED]> Date: Saturday, February 3, 2007 6:07 am Subject: Re: [Jprogramming] Spare Matrix from Index Matrix > It seems Roger is a mortal; > > s=: ?4 4$2 > (4&$.)^:_1 (4 $. s) > |domain error > (4&$.)^:_1(4 $.s) > > ...or is my copy of J too old? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
