I see my comment about conformability was too specific to matrix multiplication. I see from Roger's comment that we should consider the more general case for what constitutes conformability. I'll have to think of a more practical example, but here's one for conformability that does not require the inner dimensions to match:
(i.3 4) +/ . ,/ i.5 5 62 70 78 86 70 On Mon, Feb 22, 2010 at 10:42 AM, Roger Hui <[email protected]> wrote: > ... > For general u . v the conformability requirements depend > on the left rank of v and the shape of the result depend > on the shapes of results produced by u and v , as > the definition u . v <-> u@(v"(1+lv,_)) would indicate. > ... > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
