If I can’t remember the idiom, I look for “tap.” My favourite form is
tap =: A.&i.~ !
(perm-: tap)3. NB. Same results.....
1
Cheers,
Mike
Sent from my iPad
> On 25 May 2020, at 21:44, Skip Cave <[email protected]> wrote:
>
> perm
>
> 3 : 0
>
> z=. i.1 0
>
> for. i.y do. z=. ,/ (0 ,. 1 + z) {"2 1 \:"1 = i. 1 + {: $z end.
>
> :
>
> ,/ ({~ perm@#)"1 x comb y
>
> )
>
>
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