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Testing the zggev function of reference LAPACK from Julia
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const liblapack = "/usr/local/Cellar/lapack/3.9.0_1/lib/liblapacke.3.9.0.dylib" | |
import LinearAlgebra: LAPACK, BlasFloat, BlasInt, LAPACKException, | |
DimensionMismatch, SingularException, PosDefException, chkstride1, checksquare | |
using Base: require_one_based_indexing | |
function myggev!(jobvl::AbstractChar, jobvr::AbstractChar, A::AbstractMatrix{ComplexF64}, B::AbstractMatrix{ComplexF64}) | |
require_one_based_indexing(A, B) | |
chkstride1(A, B) | |
n, m = checksquare(A, B) | |
if n != m | |
throw(DimensionMismatch("A has dimensions $(size(A)), and B has dimensions $(size(B)), but A and B must have the same size")) | |
end | |
lda = max(1, stride(A, 2)) | |
ldb = max(1, stride(B, 2)) | |
alpha = similar(A, ComplexF64, n) | |
beta = similar(A, ComplexF64, n) | |
ldvl = 0 | |
if jobvl == 'V' | |
ldvl = n | |
elseif jobvl == 'N' | |
ldvl = 1 | |
else | |
throw(ArgumentError("jobvl must be 'V' or 'N', but $jobvl was passed")) | |
end | |
vl = similar(A, ComplexF64, ldvl, n) | |
ldvr = 0 | |
if jobvr == 'V' | |
ldvr = n | |
elseif jobvr == 'N' | |
ldvr = 1 | |
else | |
throw(ArgumentError("jobvr must be 'V' or 'N', but $jobvr was passed")) | |
end | |
vr = similar(A, ComplexF64, ldvr, n) | |
work = Vector{ComplexF64}(undef, 1) | |
lwork = BlasInt(-1) | |
rwork = Vector{Float64}(undef, 8n) | |
info = Ref{BlasInt}() | |
for i = 1:2 # first call returns lwork as work[1] | |
ccall((:zggev_, liblapack), Cvoid, | |
(Ref{UInt8}, Ref{UInt8}, Ref{BlasInt}, Ptr{ComplexF64}, | |
Ref{BlasInt}, Ptr{ComplexF64}, Ref{BlasInt}, Ptr{ComplexF64}, | |
Ptr{ComplexF64}, Ptr{ComplexF64}, Ref{BlasInt}, Ptr{ComplexF64}, | |
Ref{BlasInt}, Ptr{ComplexF64}, Ref{BlasInt}, Ptr{Float64}, | |
Ptr{BlasInt}, Clong, Clong), | |
jobvl, jobvr, n, A, | |
lda, B, ldb, alpha, | |
beta, vl, ldvl, vr, | |
ldvr, work, lwork, rwork, | |
info, 1, 1) | |
LAPACK.chklapackerror(info[]) | |
if i == 1 | |
lwork = BlasInt(work[1]) | |
resize!(work, lwork) | |
end | |
end | |
alpha, beta, vl, vr | |
end |
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