A matrix M is singular iff 0 = -/ .* M (determinant is 0). Matrix algebra on a computer is a snakepit so sometimes you may have to a number with tiny magnitude, instead of 0. One of the pleasures of rational numbers is the ability to use 0 here, no ifs or buts.
On Fri, Jul 11, 2014 at 6:46 AM, Jon Hough <[email protected]> wrote: > Reading through the dictionary, I see that %. is only defined for > non-singular matrices. > http://www.jsoftware.com/help/dictionary/d131.htm > > If I accidentally use a singular matrix, I get a domain error. So my > question is, what is the best way to test for non-singularity in J?for 2x2 > matrices, it is pretty simple. But for 8x8 matrices (for example) is there > a standard verb used to test for singularity? > > > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
