I agree totally that they are not the same. But if I understand properly, Mathematica's /. does allow a "gather" style operation, analogous to J's "key". (But I should have explicitly mentioned that I was not thinking of Oblique.)
Thanks, -- Raul On Mon, Jan 14, 2013 at 12:42 PM, Alan Stebbens <[email protected]> wrote: > Raul, > > I don't see the similarity: Mathematica /. is a pattern matching operation > (using regexps), while, as you know better than I, /. is J is oblique -- > applying or selecting array elements along an oblique axis. > > Other than the built-in mapping of functions across vectors and arrays, how > are they similar? > > -- > Alan Stebbens <[email protected]> > > > On Monday, January 14, 2013 at 7:28 AM, Raul Miller wrote: > >> I had not realized that /. has a similar (though not identical) >> meaning in J and Mathematica. >> >> http://xahlee.info/UnixResource_dir/writ/notations_mma.html >> >> -- >> Raul >> ---------------------------------------------------------------------- >> 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
