The problem is that the adverb is being evaluated at (+ Arg), rather than waiting for a y argument. It appears that execution only waits if both u and y are present, and 'u' doesn't count because it is a string and not a variable. This looks like a bug to me. A simple fix is to place a trivial mention of u in the code. A line containing only "u" before anything else will do the trick.
Marshall On Fri, Apr 6, 2012 at 7:53 PM, Paul Jackson <plj...@gmail.com> wrote: > I was writing some tools for understanding J syntax and order of > evaluation, when I encountered the following bug. While I found it on the > Android port, I've confirmed it occurs in both 32 and 64 bit Windows as > well. Just about anything done before the append, avoids the problem. > > Paul > > Arg=: 1 : 0 > y 1!:3 [2 > (5!:5 <'u') 1!:3 [2 > 0 0$'' > ) > > Debug 1 > + Arg 'u' > |value error: y > | y 1!:3[2 > |Arg[0] > > Debug 1 > 10 Arg 'x' > |value error: y > | y 1!:3[2 > |Arg[0] > > -- > Paul > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
