[Jprogramming] dyadic valence of v in u&.v ?

['Pascal Jasmin' via Programming]

not what was asked but there is also

0 0 1 0 0 1 (* >:) i.6




----- Original Message -----
From: Henry Rich <henryhrich at gmail.com>
To: programming at jsoftware.com
Sent: Sunday, January 1, 2017 4:51 PM
Subject: Re: [Jprogramming] dyadic valence of v in u&.v ?

You can't save it using &. .  But nothing stops you from writing your 
own conjunction.

semidual =: 2 : 0
:
u&.(x&v) y
)

Henry Rich

On 1/1/2017 3:40 PM, David Koppenhoefer wrote:
> Reading the wonderful NuVoc I found the gem that dyadic # has an inverse
> - it can therefore be used in &. like
>
>     >: &. (0 0 1 0 0 1&#) i.6
> 0 0 3 0 0 6
>
> , executing a function only on selected items of an array while keeping
> the shape.
>
> The bit array is a noun, but I want to compute it on the fly (from the
> right argument).  If the v in u&.v had dyadic valence, something like
>
>     0 0 1 0 0 1  >:@] &. #  i.6
>
> would be possible and the left argument could be replaced by a
> computation. Here I'm stuck. From what I understood so far this seems to
> be impossible - the v in the &-conjunctions is always monadic. Is
> there a way to save the idea?
>
>
> P.S.: needed in AoC day 24...
> ----------------------------------------------------------------------
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