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added promotions for SymTri and Tri #48536

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Dec 19, 2023
Merged

added promotions for SymTri and Tri #48536

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818dbf5
promotion in Symtri and tri
ArunS-tack Feb 5, 2023
ccae09c
Merge branch 'JuliaLang:master' into master
ArunS-tack Feb 5, 2023
d0209ed
Update tridiag.jl
ArunS-tack Feb 7, 2023
aaba026
Update tridiag.jl
ArunS-tack Feb 25, 2023
5ff0472
Merge branch 'master' into master
dkarrasch Dec 7, 2023
b6a0b82
Update stdlib/LinearAlgebra/src/tridiag.jl
dkarrasch Dec 7, 2023
550a246
Update stdlib/LinearAlgebra/src/tridiag.jl
dkarrasch Dec 9, 2023
71bcfea
Update stdlib/LinearAlgebra/src/tridiag.jl
dkarrasch Dec 10, 2023
22b0a55
Update stdlib/LinearAlgebra/src/tridiag.jl
dkarrasch Dec 10, 2023
6982bca
catch cases of StackOverflow
dkarrasch Dec 10, 2023
e171ae6
fix typos
dkarrasch Dec 10, 2023
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14 changes: 10 additions & 4 deletions stdlib/LinearAlgebra/src/tridiag.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -73,6 +73,8 @@ function SymTridiagonal{T}(dv::AbstractVector, ev::AbstractVector) where {T}
SymTridiagonal(convert(AbstractVector{T}, dv)::AbstractVector{T},
convert(AbstractVector{T}, ev)::AbstractVector{T})
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end
SymTridiagonal(d::AbstractVector{T}, e::AbstractVector{S}) where {T,S} =
SymTridiagonal{promote_type(T, S)}(d, e)

"""
SymTridiagonal(A::AbstractMatrix)
Expand Down Expand Up @@ -513,12 +515,16 @@ julia> Tridiagonal(dl, d, du)
"""
Tridiagonal(dl::V, d::V, du::V) where {T,V<:AbstractVector{T}} = Tridiagonal{T,V}(dl, d, du)
Tridiagonal(dl::V, d::V, du::V, du2::V) where {T,V<:AbstractVector{T}} = Tridiagonal{T,V}(dl, d, du, du2)
function Tridiagonal{T}(dl::AbstractVector, d::AbstractVector, du::AbstractVector) where {T}
Tridiagonal(dl::AbstractVector{T}, d::AbstractVector{S}, du::AbstractVector{U}) where {T,S,U} =
Tridiagonal{promote_type(T, S, U)}(dl, d, du)
Tridiagonal(dl::AbstractVector{T}, d::AbstractVector{S}, du::AbstractVector{U}, du2::AbstractVector{V}) where {T,S,U,V} =
Tridiagonal{promote_type(T, S, U, V)}(dl, d, du, du2)
Tridiagonal{T}(dl::AbstractVector, d::AbstractVector, du::AbstractVector) where {T} =
Tridiagonal(map(x->convert(AbstractVector{T}, x), (dl, d, du))...)
end
function Tridiagonal{T}(dl::AbstractVector, d::AbstractVector, du::AbstractVector, du2::AbstractVector) where {T}
Tridiagonal{T}(dl::AbstractVector, d::AbstractVector, du::AbstractVector, du2::AbstractVector) where {T} =
Tridiagonal(map(x->convert(AbstractVector{T}, x), (dl, d, du, du2))...)
end
Tridiagonal{T,V}(A::Tridiagonal) where {T,V<:AbstractVector{T}} =
Tridiagonal{T,V}(A.dl, A.d, A.du)
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"""
Tridiagonal(A)
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5 changes: 5 additions & 0 deletions stdlib/LinearAlgebra/test/tridiag.jl
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Expand Up @@ -505,6 +505,11 @@ end
@test SymTridiagonal([1, 2], [0])^3 == [1 0; 0 8]
end

@testset "Issue #48505" begin
@test SymTridiagonal([1,2,3],[4,5.0]) == [1.0 4.0 0.0; 4.0 2.0 5.0; 0.0 5.0 3.0]
@test Tridiagonal([1, 2], [4, 5, 1], [6.0, 7]) == [4.0 6.0 0.0; 1.0 5.0 7.0; 0.0 2.0 1.0]
end

@testset "convert for SymTridiagonal" begin
STF32 = SymTridiagonal{Float32}(fill(1f0, 5), fill(1f0, 4))
@test convert(SymTridiagonal{Float64}, STF32)::SymTridiagonal{Float64} == STF32
Expand Down