just showing how Devon's approach might work with some helper verbs. Sometimes getting a result first and then going to documentation is a better way to learn. Use both approaches.
A=. 1 2; 1 2 3 [ P =. (2 _2) f=. 13 : 'x+6*y' P f each A v=. f each P v A NB. same result To find out what v looks like tacitly, use the flatten verb NB. representation helpers paren[paren=.9!:3(6) [ nparen=.9!:3(5) [ boxed=.9!:3(2) NB. flatten -- which means 'replace verbs with J primitive verb contents v f. ([ + (6 * ]))&.> f each f. NB. yields the same result ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
