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Proposal: sparse overlay #13

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putianyi889 opened this issue Mar 2, 2024 · 0 comments

putianyi889 commented Mar 2, 2024 •

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Motivation: JuliaSparse/SparseArrays.jl#512

Solution (just a brief sketch):

struct SparseOverlay{T,N,D<:AbstractArray{T,N}} <: AbstractArray{T,N}
    data::Dict{CartesianIndex{N},T}
    base::D
end
const SparseArray{T,N} = SparseOverlay{T,N,FillArrays.Zeros{T,N}}

@inline function Base.getindex(a::SparseOverlay{T,N}, I::CartesianIndex{N}) where {T,N}
    @boundscheck checkbounds(a, I)
    return get(a.data, I, a.base[I])
end

putianyi889 mentioned this issue

Sparse array of string types JuliaSparse/SparseArrays.jl#512

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