On Wed, Mar 23, 2011 at 7:43 AM, Adrian May <[email protected]> wrote: > You probably already guessed what the problem is. I want to write something > like: ... > vary =. +&(?10) ... > but it only evaluates the ? once and reuses that value. I want a different > number every time. How do I do that?
If you examine the definition for vary, you will see that you have picked a random number and incorporated that random number into its definition. But what you really want is for ? to wait until you have passed an argument to vary before ? evaluates. To accomplish that, in place of the noun 10, you should be using a verb that always returns the result 10. That way, it will not evaluate until you pass it an argument. One way to accomplish this would be: vary=: +&(? bind 10) But you can also give 10 a rank which automatically produces a constant valued verb. (And bind does that for you.) FYI, -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
