This is a bug but it is also how 13 : works. As a workaround, it
needs to defer evaluation to run time by some tricks. eg,
13 : '-:y+0 1 2=(? bind 3)y'

Чт, 03 ноя 2016, jprogramming написал(а):
> 
> The following J-code produces the Sierpinski triangle.
> f=. 3 : '-:y+0 1 2=?3'
> 'dot'plot+/(3%:_1 0 1)*|:f^:(i.10000)1 1 1%3
> 
> Note however that the tacit code generator (13 :) evaluates the random number 
> generator (?) at compile time rather than at run time.
>    13 : '-:y+0 1 2=?3'
> [: -: 1 0 0 + ]
> I think that is a bug.
> Thank you.
> Bo.
> Game of Chaos
> 
>   
> |  
> |   |  
> Game of Chaos
>  Java applet that produces the Sierpinski triangle by shooting dice  |  |
> 
>   |
> 
>  
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