part of boolean vector 'bv' should actually be:
;<\1,0$~ <:-:<:%:>:4*+:#y
================
Arie Groeneveld schreef:
> Upper or right tri-mat:
>
> utmfv=: 3 : 0
> bv=. ;<\.1,~0$~2-~-:>:%:>:4*+:#y
> |."1 bv |.;. 2 y
> )
>
> Lower or left tri-mat;
>
> ltmfv=: 3 : 0
> bv=. ;<\1,0$~2-~-:>:%:>:4*+:#y
> bv ,;. 1 y
> )
>
> utmfv 1+i.6
> 1 2 3
> 0 4 5
> 0 0 6
>
> ltmfv 1+i.6
> 1 0 0
> 2 3 0
> 4 5 6
>
> It's a pity that 'utmfv' suffers from the double reversing.
>
>
> =@@i
>
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
>
>
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
