Why is it necessary to include & in each of these example? (0 1&|:A)-:0 1|:A=:?3 2 4$5 1 (2 0 1|:A)-:0 1|:A 1 (0 1 2|:B)-:3 0 1 2|:B=:?3 2 5 4$5 1 (0 1 2&|:B)-:3 0 1 2&|:B=:?3 2 5 4$5 1
Linda -----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Dan Bron Sent: Friday, December 07, 2012 6:05 PM To: programm...@jsoftware.com Cc: programm...@jsoftware.com Subject: Re: [Jprogramming] indirect assignment and rank question Something I never wrapped my head around with |: is what exactly the DoJ means when it says axes are "run together" when the LHA is boxed. -Dan On Dec 7, 2012, at 3:28 PM, Marshall Lochbaum <mwlochb...@gmail.com> wrote: > 0 1 2&|: will do the job. > > I recommend reading the dictionary definition of |: through a few times. > In particular, note that 0 1&|: on a rank three array is the same as > 2 0 1&|: , and 0 1 2&|: turns into 3 0 1 2&|: on a rank four array. > > Marshall > > On Fri, Dec 07, 2012 at 03:02:49PM -0500, Brian Schott wrote: >> I am working with photographic images which use RGB color. >> The array d is a single image and the array D is now 2 images but I >> want D to contain any number of images. And I want split out the R,G, >> and B part which I can do for d, but I am having difficulty with the >> analogous r, g, and b for D. >> >> $d >> 50 50 3 >> $D >> 2 50 50 3 >> >> 'R G B'=: 0 1|: d >> $G >> 50 50 >> >> What is the mysteryverb that will produce ($g)-:2 50 50 in the >> following expression? >> 'r g b'=: mysteryverb D >> >> Thanks, >> >> (B=) >> --------------------------------------------------------------------- >> - 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 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
