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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] A not so simple product
- From: "Benoit Jacob" <jacob.benoit.1@xxxxxxxxx>
- Date: Wed, 10 Dec 2008 15:46:12 +0100
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I just discovered yet another bug in diagonal product. This part of
Eigen is really very buggy!!
To grade my exam I made this program:
#define EIGEN_DEFAULT_IO_FORMAT EIGEN_DOCS_IO_FORMAT
#include <Eigen/QR>
using namespace Eigen;
using namespace std;
int main()
{
Matrix3d A;
A << 0,1,1,
1,0,1,
1,1,0;
SelfAdjointEigenSolver<Matrix3d> s(A);
cout << "Eigenvalues:" << endl << s.eigenvalues() << endl;
cout << "Eigenvectors:" << endl << s.eigenvectors() *
(s.eigenvectors().row(2).cwise().inverse().asDiagonal()).eval() <<
endl;
}
This program produces the correct result.
But if I remove the .eval() it produces the wrong result.
Fixing diagonal product is really my top priority in eigen.... will
take me a while though as a first have to grade 400 exams.
Cheers,
Benoit
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