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- To: Eigen <eigen@xxxxxxxxxxxxxxxxxxx>
- Subject: Re: [eigen] potential bug?
- From: Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>
- Date: Tue, 3 Aug 2010 20:46:46 +0200
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Seems to be a bug. With HouseholderQR it works.
Shall I add it as a unit test?
- Hauke
On Tue, Aug 3, 2010 at 7:53 PM, Hauke Heibel
<hauke.heibel@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> this code here produces a norm of around 2. Is that a bug or is it me?
>
> - Hauke
>
> #include <Eigen/Eigen>
>
> #include <iostream>
>
> using namespace Eigen;
>
> void main()
> {
> typedef Matrix4d MatrixType;
> MatrixType m = MatrixType::Random();
>
> ColPivHouseholderQR<MatrixType> qr(m);
>
> MatrixType R = qr.matrixQR().triangularView<Upper>();
> MatrixType Q = qr.householderQ();
>
> std::cout << qr.rank() << std::endl;
> std::cout << (Q*R - m).norm() << std::endl;
> }
>