cumsum and friends don't support tuples

[ssfrr]

cumsum(x), cumprod(x) and diff(x) (maybe others?) don't have methods defined for tuples. vec also doesn't have a tuple method so it can't be used to convert (though if cumsum(::Tuple) were implemented I'd expect it to also return a tuple)

[stevengj]

You can use collect to convert a tuple to an array, e.g. cumsum(collect(x)) where x is a tuple.

See also #25766.

[KristofferC]

Tuples are not AbstractArrays so perhaps better to use StaticArrays.jl for this?

[mbauman]

On #25766 cumsum((1,2,3)) returns an Array [1,3,6], so that's not quite what I'd want here.

I've thought before that (1, cumprod(front(size(A)))...) would be helpful just for pseudocode in expressing stride computations. That's a case where you want to use and get back tuples… and you want a highly optimized tuple-specific implementation to make it fast.

[bramtayl]

Are all the items in the tuple the same type? If they aren't and the tuple is short you might be better of going with recursion? I could make an accumulate_unrolled function in RecurUnrolled

[ssfrr]

@stevengj thanks for that suggestion, collect is definitely more concise than what I did (using an array comprehension)

@KristofferC

Tuples are not AbstractArrays so perhaps better to use StaticArrays.jl for this?

For me this came up in the context of wanting to do something like foo(xs...) = cumsum(xs), and wanting a tuple output, so it would be more convenient to stay in tuple-land.

[tkf]

I implemented accumulate(op, xs::Tuple) in #34654.