On Sun, Dec 26, 2010 at 8:51 PM, PackRat <pack...@anet.com> wrote: > I'm just learning about the .e primitive, and I was wondering how I do > a match when a close (but not exact) match is involved. In other > words, how do I do the equivalent of this: > > ( a +/- b ) .e y
I think you mean e. instead of .e > where the value of b might be, say, 5 or 8 or 12 or whatever (not some > near-zero tolerance factor). If we assume that b is a single positive number and that a and y are rank 1: ~:/((/:~y) (-,:+)b) I."1 a That said, note that this is testing for values contained in the interval [y-b,y+b) and if you want [y-b,y+b] you could use: (a.e.y-b)+.~:/((/:~y) (-,:+)b) I."1 a -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
