View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000913 | OpenFOAM | Bug | public | 2013-07-08 15:16 | 2015-02-05 09:24 |
| Reporter | hk318i | Assigned To | henry | ||
| Priority | high | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Platform | Linux | OS | Other | OS Version | (please specify) |
| Summary | 0000913: SVD outputs vectors and values have wrong arrangement | ||||
| Description | Based on Singular Value decomposition theory, the diagonal matrix S values should arranged in decreasing order. Also U and V matrices should be arranged based on S matrices. The problem in the current implementation is that the output for the three matrices are wrong however the values are right. I compared the results against GNU Scientific Library (GSL) and Octave. | ||||
| Tags | No tags attached. | ||||
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This is true. Do you need them in descending order? |
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yes, I do |
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You can sort U, V and S yourself if you need it. It is only a convention that they are sorted in descending order. None of our applications have required it so far. |
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Thank you, I will modify it. Could you confirm which method is used in OpenFOAM? |
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Bidiagonalization followed by QR. Another decent library is Eigen, which uses a different method: http://eigen.tuxfamily.org/dox/classEigen_1_1JacobiSVD.html |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2013-07-08 15:16 | hk318i | New Issue | |
| 2013-07-08 15:47 |
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Note Added: 0002312 | |
| 2013-07-08 15:49 | hk318i | Note Added: 0002313 | |
| 2013-07-08 16:30 |
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Note Added: 0002314 | |
| 2013-07-08 16:51 | hk318i | Note Added: 0002315 | |
| 2013-07-09 09:25 |
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Note Added: 0002316 | |
| 2015-02-05 09:24 | henry | Status | new => closed |
| 2015-02-05 09:24 | henry | Assigned To | => henry |
| 2015-02-05 09:24 | henry | Resolution | open => no change required |
