an adverb I think is useful

[Pascal Jasmin]

expandy =: 1 : '[ u ((,:@] $~ #@[)^:(~:&#))' NB. if x and y count don't agree, reshape y to match x count, assuming that y is a single item

at first glance / does a lot of this

1 2 3 +/ 1 2

2 3

3 4

4 5

1 2 3 + expandy 1 2

2 3

3 4

4 5

but

   1 2 3 +/ 1 2 3

2 3 4

3 4 5

4 5 6

1 2 3 + expandy 1 2 3

2 4 6


   1 2 3 +/ expandy 1 2

2 3

2 3

2 3




3 4

3 4

3 4




4 5

4 5

4 5


for functions that expect a match in count for x and y, I think the adverb helps.  Can still pass u/ to get "that behaviour" on the expanded y.

any improvements on generalization or criticism for being useless?

[Raul Miller]

I guess I cannot imagine when I would find this useful.

It does avoid an error condition, but generally speaking errors are
thrown for situations where the coder has likely made a mistake.

This does not make it useless, of course. But this also does not make it useful.

--
Raul

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