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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