Verbs can't return verbs (sad but true). You want the adverb (&p.)
1 2 3 (&p.) 4 57 1 2 3 (&p.) ------T-T--┐ │1 2 3│&│p.│ L-----+-+--- Marshall -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Alex Gian Sent: Saturday, April 02, 2011 12:10 PM To: Programming forum Subject: [Jprogramming] How to make 'y & p.' a monad? Been away from J for a few months, and coming back - I'll be honest - I find it quite frustrating at how difficult it seems (for me anyway) to get back into the J mindset. Intuitive is not the first word that springs to mind... really wish it was. Anyway, this is what I was trying to do: Create a monadic verb that has the effect of mp =: monad : 'y & p.' The above does not work, giving me a syntax error if I try mp 1 2 3 I also tried various tacit ways using '~', ']', etc. to no avail. All I really want is to have a monadic verb, preferably tacit, but hell, explicit will do if it works, say, "makepoly" which will create the polynomial (verb) such that (makepoly 1 2 3) 4 or mypoly =: makepoly 1 2 3 mypoly 4 will have the same effect as executing 1 2 3 p. 4 i.e => 57 What have I missed? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
