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Strides on when SubArray has a scalar sub index

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
julia
Domain
data

Research direction

Reproduce the two examples in the Julia REPL, focusing on ArrayInterface.StrideIndex with views that use scalar indices. Read the StrideIndex implementation and compare its results with Aview indexing; done means both reported indices match the corresponding Aview values.

Written by the indexing model from the issue text.

Description

I've been getting incorrect results when using scalar indexing that doesn't start with one on views.

julia> A = zeros(3, 4, 5);

julia> A[:] = 1:60;

julia> Aview = view(A, :, 2, :);

julia> ArrayInterface.StrideIndex(Aview)[1,1]
1

julia> Aview[1,1]
4.0

julia> Aview = view(A, 2, :, :);

julia> ArrayInterface.StrideIndex(Aview)[1,1]
1

julia> Aview[1,1]
2.0

Should we be combining those scalar indices with strides?

Dominant language
Julia
Stars
14
Forks
8
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