Is there some reason why 128!:0 only works on nonsingular matrices? For example
128!:0 > 0 0; 1 1 |domain error | 128!:0>0 0;1 1 However 'q r'=: (2 2$ 0 _1 _1 0);2 2 $ _1 _1 0 0 seems a perfectly good QR reduction. q (+/ .*) r 0 0 1 1 Best wishes, John ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
