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Fix sparse constructor when Tridiagonal/SymTridiagonal are empty #42574

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merged 7 commits into from
Oct 15, 2021
Merged

Fix sparse constructor when Tridiagonal/SymTridiagonal are empty #42574

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8d3b328
add path for empty structured matrices in sparse constructors
mcognetta Oct 10, 2021
67a6638
Update stdlib/SparseArrays/test/sparse.jl
mcognetta Oct 10, 2021
9729d89
1x1 tests
mcognetta Oct 13, 2021
850436b
reduce allocations
mcognetta Oct 13, 2021
11cdb16
Update sparsematrix.jl
mcognetta Oct 14, 2021
df9d74e
Apply suggestions from code review
mcognetta Oct 14, 2021
06adc30
add test for SparseMatrixCSC{Tv, Ti}(::Diagonal)
mcognetta Oct 14, 2021
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6 changes: 5 additions & 1 deletion stdlib/SparseArrays/src/sparsematrix.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -563,6 +563,8 @@ SparseMatrixCSC(M::Matrix) = sparse(M)
SparseMatrixCSC(T::Tridiagonal{Tv}) where Tv = SparseMatrixCSC{Tv,Int}(T)
function SparseMatrixCSC{Tv,Ti}(T::Tridiagonal) where {Tv,Ti}
m = length(T.d)
m == 0 && return SparseMatrixCSC{Tv,Ti}(0, 0, ones(Ti, 1), Ti[], Tv[])
m == 1 && return SparseMatrixCSC{Tv,Ti}(fill(T[1,1], (1,1)))

colptr = Vector{Ti}(undef, m+1)
colptr[1] = 1
Expand Down Expand Up @@ -593,6 +595,8 @@ end
SparseMatrixCSC(T::SymTridiagonal{Tv}) where Tv = SparseMatrixCSC{Tv,Int}(T)
function SparseMatrixCSC{Tv,Ti}(T::SymTridiagonal) where {Tv,Ti}
m = length(T.dv)
m == 0 && return SparseMatrixCSC{Tv,Ti}(0, 0, ones(Ti, 1), Ti[], Tv[])
m == 1 && return SparseMatrixCSC{Tv,Ti}(fill(T[1,1], (1,1)))

colptr = Vector{Ti}(undef, m+1)
colptr[1] = 1
Expand Down Expand Up @@ -623,7 +627,7 @@ end
SparseMatrixCSC(B::Bidiagonal{Tv}) where Tv = SparseMatrixCSC{Tv,Int}(B)
function SparseMatrixCSC{Tv,Ti}(B::Bidiagonal) where {Tv,Ti}
m = length(B.dv)
m == 0 && return SparseMatrixCSC{Tv,Ti}(zeros(Tv, 0, 0))
m == 0 && return SparseMatrixCSC{Tv,Ti}(0, 0, ones(Ti, 1), Ti[], Tv[])

colptr = Vector{Ti}(undef, m+1)
colptr[1] = 1
Expand Down
21 changes: 21 additions & 0 deletions stdlib/SparseArrays/test/sparse.jl
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Expand Up @@ -1699,6 +1699,27 @@ end
@test S == S2
end

@testset "Sparse construction with empty/1x1 structured matrices" begin
empty = spzeros(0, 0)

@test sparse(Diagonal(zeros(0, 0))) == empty
@test sparse(Bidiagonal(zeros(0, 0), :U)) == empty
@test sparse(Bidiagonal(zeros(0, 0), :L)) == empty
@test sparse(SymTridiagonal(zeros(0, 0))) == empty
@test sparse(Tridiagonal(zeros(0, 0))) == empty

one_by_one = rand(1,1)
sp_one_by_one = sparse(one_by_one)

@test sparse(Diagonal(one_by_one)) == sp_one_by_one
@test sparse(Bidiagonal(one_by_one, :U)) == sp_one_by_one
@test sparse(Bidiagonal(one_by_one, :L)) == sp_one_by_one
@test sparse(Tridiagonal(one_by_one)) == sp_one_by_one

s = SymTridiagonal(rand(1), rand(0))
@test sparse(s) == s
end

@testset "error conditions for reshape, and dropdims" begin
local A = sprand(Bool, 5, 5, 0.2)
@test_throws DimensionMismatch reshape(A,(20, 2))
Expand Down