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Replace padded_similar by similar #634

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Replace padded_similar by similar #634

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5 changes: 1 addition & 4 deletions src/b-splines/prefiltering.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2,9 +2,6 @@ padded_axes(axs, it::InterpolationType) = (ax->padded_axis(ax, it)).(axs)
padded_axes(axs::NTuple{N,AbstractUnitRange}, it::NTuple{N,InterpolationType}) where N =
padded_axis.(axs, it)

padded_similar(::Type{TC}, inds::Tuple{Vararg{Base.OneTo{Int}}}) where TC = Array{TC}(undef, length.(inds))
padded_similar(::Type{TC}, inds) where TC = OffsetArray{TC}(undef, inds)

# Narrow ax by the amount that axpad is larger
padinset(ax::AbstractUnitRange, axpad) = 2*first(ax)-first(axpad):2*last(ax)-last(axpad)
function padinset(ax::Base.OneTo, axpad::Base.OneTo)
Expand All @@ -20,7 +17,7 @@ copy_with_padding(A, it) = copy_with_padding(eltype(A), A, it)
function copy_with_padding(::Type{TC}, A, it::DimSpec{InterpolationType}) where {TC}
indsA = axes(A)
indspad = padded_axes(indsA, it)
coefs = padded_similar(TC, indspad)
coefs = similar(Array{TC}, indspad)
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Copilot AI Oct 1, 2025

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The replacement similar(Array{TC}, indspad) may not be functionally equivalent to the original padded_similar(TC, indspad). The original function returned OffsetArray{TC}(undef, inds) for non-OneTo indices, but similar(Array{TC}, indspad) will always return a regular Array type regardless of the index type. This could break functionality when indspad contains offset indices.

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Is that actually a problem based on how coefs is used?

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Well Copilot isn't correct here. similar will return an OffsetArray if the package is loaded, so there's no difference here.

if indspad == indsA
coefs = copyto!(coefs, A)
else
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