unb is
i.@# ({ :: $:) unb4
so if there is an error in the { it will submit the same operands to
(now dyadic) $: (=unb) and that will probably fail in the # .
I think,
Henry Rich
On 2/22/2011 11:46 AM, Raul Miller wrote:
> From http://rosettacode.org/wiki/Unbias_a_random_generator
>
> biased=: 0 = ?
> unbiased=: i.@# { ::$: 2 | 0 3 -.~ _2 #.\ 4&* biased@# ]
>
> unbias&.> 100#6
> |length error
>
> I see only one verb that can be generating a length error, but just to be
> sure:
>
> unb1=: 4&* biased@# ]
> unb2=: _2 #.\ unb1
> unb3=: 0 3 -.~ unb2
> unb4=: 2 | unb3
> unb=: i.@# { ::$: unb4
>
> unb&.> 1000#6
>
> The length error occurs in unb, which means that :: sometimes fails to
> trap the error.
>
> 9!:14''
> j602/2008-03-03/16:45
>
> I get the same error in j7
> 9!:14''
> j701/2011-01-10/11:25
>
> FYI,
> --
> Raul
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