`eachslice(ones(3),dims=2)`

[PaulSoderlind]

fails on Julia 1.09 and 1.10-beta3, but eachcol(ones(3)) produces a ColumnSlices. In fact, test.arrayops.jl has a test for the latter on line 2275. Also, selectdim(ones(3),2,1) and view(ones(3),:,1) work.

This difference (inconsistency?) is inconvenient.

[adienes]

if you ask me, eachcol should fail too. ones(3) doesn't have any columns, so why should either of these work?

but it looks like @stevengj expressed support --- how would you suggest to constrain the dimensions here? should eachslice be able to lift an array to any higher dimension? if so, doesn't that mean eachslice is stepping on stack's toes?

julia> stack(Ref(ones(3)); dims=2)
3×1 Matrix{Float64}:
 1.0
 1.0
 1.0

[mbauman]

I think of eachslice(A; dims=2) as doing something like (A[:, i] for i in axes(A, 2)). Both indexing and axes support those trailing dimensions. So this seems in line with that.