Re: [Jprogramming] Tacit J and indexed replacement

[Dan Bron]

I wrote:
>  mergeMask =: (&>) / (`>) } (@:,) (&<)

In retrospect, given that x and y will by definition agree in type and
shape, we can skip the boxing and simplify mergeMask:

           mergeMask =: / (`]) } (@:,:)
           
           x (2|[) mergeMask y
         0 11  2
        13  4 15
         6 17  8
           
           (2|[) mergeMask 
        (2 | [)/`]}@:,:

-Dan
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