[ViralBShah]

ldiv! of a real UmfpackLU with a ComplexF32 vector throws a MethodError; the matrix case and \ work.

Before

julia> F = lu(sparse([2.0 1; 1 3])); ldiv!(F, ComplexF32[1, 2])
ERROR: MethodError: no method matching solve!(::Vector{Float64}, ::SparseArrays.UMFPACK.UmfpackLU{Float64, Int64}, ::Vector{Float32}, ::Int64; workspace::SparseArrays.UMFPACK.UmfpackWS{Int64})

After

julia> F = lu(sparse([2.0 1; 1 3])); ldiv!(F, ComplexF32[1, 2])
2-element Vector{ComplexF32}:
 0.2f0 + 0.0f0im
 0.6f0 + 0.0f0im

The vector kernel for a complex right-hand side and a real factor solves the real and imaginary parts separately, through a scratch buffer it built with c = real.(b). That buffer has the real eltype of b, Float32 here, and UMFPACK only solves in Float64. It is now allocated as Float64 and filled in place, as the matrix kernel already does. The 3-argument form and transpose(F) and F' go through the same kernel.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.72%. Comparing base (48204b2) to head (1fcdf3b).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1112   +/-   ##
=======================================
  Coverage   94.72%   94.72%           
=======================================
  Files          16       16           
  Lines       10310    10315    +5     
=======================================
+ Hits         9766     9771    +5     
  Misses        544      544           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.