Yes, you can rewrite (+./@:*.) as (+./ . *.).

Hehe, in terms of peculiar ways and unknown reasons, I invite you to think
about how you might go about implementing a high-performance version of
this operation where X and Y are restricted to boolean elements, Y is
static and X dynamically changes.

On Thu, Oct 13, 2016 at 10:32 AM, Erling Hellenäs <erl...@erlinghellenas.se>
wrote:

> It is this operation +./ . *. we rewrite in peculiar ways for unknown
> reasons?
>
> [ x=: 1 0 1 1 0
>
> 1 0 1 1 0
>
> [ y=: 5 6 $1 0 0 0 0 0 0 1 0 1 1 0 0 1 0 0 0 1 0 0 0 0 1 1 0 1 1 1 0 1
>
> 1 0 0 0 0 0
>
> 0 1 0 1 1 0
>
> 0 1 0 0 0 1
>
> 0 0 0 0 1 1
>
> 0 1 1 1 0 1
>
> x +./ . *. y
>
> 1 1 0 0 1 1
>
>
> /Erling
>
>
>
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