Here's an ugly one:

,"_1&.>/ 2 <@,.\"1 A

=@@i



Dan Bron schreef:
> Aai wrote:
>   
>>  , 2 2 <;. _3 &.|:A
>>     
>
> That  &.  is superfluous.
>
> Also, here's another method using cut, though it is less elegant:
>
>     (1 0 $~ {:$A) <;.1 |: A
>
> you could also move the  |:  inside the cut, though that's likely slower:
>
>     ( '' ; 1 0 $~ {:$A ) <@:|:;.1 A
>
> I wonder if there's a way to do this without transposing (or its
> equivalents).
>
> -Dan
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>
>   
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