Requesting specializations for operations on Hermitian matrices

[kbarros]

Is it possible that the following could be made to work?

using LinearAlgebra
A = hermitianpart(randn(3,3)) # Hermitian{Float64, Matrix{Float64}}

A .+= Diagonal([1, 2, 3]) # ArgumentError: Cannot set a non-diagonal index in a Hermitian matrix
A .*= 2                   # Same

For now, this seems like a work-around:

A.data .+= Diagonal([1, 2, 3])
A.data .*= 2

[kbarros]

Some discussion on Slack: https://julialang.slack.com/archives/C6A044SQH/p1745530129376779?thread_ts=1745525156.030529&cid=C6A044SQH

[nsajko]

Related issues, duplicate?

• In-place broadcast on Symmetric and Hermition fails against constants LinearAlgebra.jl#646
• When not trying to set non-diagonal broadcast get: Cannot set a non-diagonal index in a Hermitian/Symmetric matrix LinearAlgebra.jl#772
• Symmertic/Hermitian Matrixes are too fussy about mutating operations LinearAlgebra.jl#773

[kbarros]

Yup, those previous issues cover it, thank you.