Add hermitianpart method for Number types

Author: GianmarcoCuppari

src/symmetric.jl

@@ -974,6 +974,7 @@ end
 
 """
     hermitianpart(A::AbstractMatrix, uplo::Symbol=:U) -> Hermitian
+    hermitianpart(x::Number) -> Real
 
 Return the Hermitian part of the square matrix `A`, defined as `(A + A') / 2`, as a
 [`Hermitian`](@ref) matrix. For real matrices `A`, this is also known as the symmetric part
@@ -987,6 +988,7 @@ See also [`hermitianpart!`](@ref) for the corresponding in-place operation.
     This function requires Julia 1.10 or later.
 """
 hermitianpart(A::AbstractMatrix, uplo::Symbol=:U) = Hermitian(_hermitianpart(A), uplo)
+hermitianpart(x::Number) = real(x)
 
 """
     hermitianpart!(A::AbstractMatrix, uplo::Symbol=:U) -> Hermitian

test/symmetric.jl

@@ -1035,6 +1035,14 @@ end
         @test Aherm isa Hermitian
         @test Aherm.uplo == LinearAlgebra.char_uplo(uplo)
     end
+    @testset "hermitianpart for numbers" begin
+    @test hermitianpart(3 + 4im) == 3
+    @test hermitianpart(5) == 5
+    @test hermitianpart(2.5) == 2.5
+    @test hermitianpart(-1 + 0im) == -1
+    @test typeof(hermitianpart(3 + 4im)) == Int
+    @test typeof(hermitianpart(2.5 + 3im)) == Float64
+end
 end
 
 @testset "Structured display" begin