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Forward scaling lmul!/rmul! for Tridiagonal to bands #1284

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Merged
merged 1 commit into from
Apr 11, 2025
Merged

Forward scaling lmul!/rmul! for Tridiagonal to bands #1284

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12 changes: 6 additions & 6 deletions src/tridiag.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -872,9 +872,9 @@ function rmul!(T::Tridiagonal, x::Number)
iszero(y) || throw(ArgumentError(LazyString("cannot set index (3, 1) off ",
lazy"the tridiagonal band to a nonzero value ($y)")))
end
T.dl .*= x
T.d .*= x
T.du .*= x
rmul!(T.dl, x)
rmul!(T.d, x)
rmul!(T.du, x)
return T
end
function lmul!(x::Number, T::Tridiagonal)
Expand All @@ -884,9 +884,9 @@ function lmul!(x::Number, T::Tridiagonal)
iszero(y) || throw(ArgumentError(LazyString("cannot set index (3, 1) off ",
lazy"the tridiagonal band to a nonzero value ($y)")))
end
@. T.dl = x * T.dl
@. T.d = x * T.d
@. T.du = x * T.du
lmul!(x, T.dl)
lmul!(x, T.d)
lmul!(x, T.du)
return T
end
/(A::Tridiagonal, B::Number) = Tridiagonal(A.dl/B, A.d/B, A.du/B)
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