Note also that you can trap the domain error that %. gives you. -- Raul
On Fri, Jul 11, 2014 at 9:52 AM, Roger Hui <[email protected]> wrote: > 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
