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jordancurve

00:00

What are some examples of things that would go wrong if dyadic % was replaced by / and " //" was used to introduce comments?

Anything other than people being confused because / isn't the traditional APL symbol for division and/or loss of backward compatibility?

Bubbler

Well, to my knowledge \ is intentionally chosen to be symmetric to /, because most (all?) meanings are closely related. Split-join, decode-encode, reduce-cumulative reduce, etc.

Changing the symbol loses the symmetry.

jordancurve

I'm not suggesting changing / when used with other operators. I'm only suggesting changing / alone when used as a dyadic operator like x / y.

where x & y are lists or numbers.

Bubbler

Again, x/y and x\y are symmetric in that meaning too.

jordancurve

so :/ etc wouldn't change, the way I'm picturing it. But I'm not an expert and I haven't thought it through...

Bubbler

(need to look up K9 manual thing to see what changed to what, but)

jordancurve

00:04

I see what you mean. / and \ as join/split is consistent.

coltim

@jordancurve the tricky part there is handling the x f/y scenario (versus f x/y). there's this

(basically, is x in x f/y part of the reduction (i.e. the seed or number of iterations) or is it just a UDF/noun)

jordancurve

@coltim Interesting, thanks.

Is there a way to get &1 0 1 to behave similar to &1 0 2? that is, I want a way to force the "generate x0 copies 0, x1 copies of 1, ..., x_N copies of N" behavior, regardless of whether every element should get at most 1 copy.

Bubbler

What's the difference?

coltim

@jordancurve I dunno if this addresses what you are looking for, but...

Bubbler

Doesn't &1 0 1 return 0 2, which is 1 copies of 0, 0 copies 1, and 1 copies of 2?

jordancurve

00:16

Hmm, maybe it does! I was thinking it was just giving me the indices where the array is non-zero, but maybe that's the same thing as the other behavior...

Never mind, then! Thanks, Bubbler.

9 hours later…