Wild guess ... your expression results in random 8 bit characters of
which several are "control" characters - so the display mechanism you
used (I use jconsole output in Apple terminal) may (will likely) behave
very strangely .... All bets are off on what gets displayed.
On 2012/01/26 13:10 , Tirrell, Jordan (Consultant) wrote:
> I was using roll to generate some random varchar data in jgtk.
> Specifically, the line I executed was
>
> <@(a.{~?&256)"_1 @ ?&256 ]10
>
> I was very surprised to see output that included a run of 302 chars that
> is a direct quote from a script I had open (but had not run).
>
> I know some pseudorandom generators do things like read system memory,
> but the vocab says J uses the Mersenne Twister algorithm by default,
> which I think shouldn't behave like this.
>
> Could this be some weird GTK display glitch? I was simultaneously
> experiencing the bug where it can't properly draw boxes.
>
> Has anyone else seen this behavior? Unfortunately it's probably next to
> impossible to duplicate.
>
> Jordan
>
>
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