On Sun, May 10, 2009 at 11:35 PM, John Randall
<[email protected]> wrote:
> I want to swap two array elements, and I am trying to do it by
> transposing indices. So far I have come up with
>
> swapindices=:}: @: C. @: (; ~.)
>
> 10 swapindices 3 5
> 0 1 2 5 4 3 6 7 8 9
> 10 swapindices 3 9
> 0 1 2 9 4 5 6 7 8 3
> 10 swapindices 3 3
> 0 1 2 3 4 5 6 7 8 9
>
> Is this a sensible approach, or I am missing something much simpler?
It is sensible, but there are others, eg.
(<1 2) C. 'wierd'
weird
1 2 |.@:{`[`]} 'wierd'
weird
Ambrus
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