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ID Category Severity Reproducibility Date Submitted Last Update
0000419 [ALGLIB] Linear algebra minor have not tried 2011-12-22 11:52 2011-12-22 11:53
Reporter SergeyB View Status public  
Assigned To SergeyB
Priority normal Resolution fixed  
Status resolved   Product Version
Summary 0000419: FIXED: inconvergence of the low-accuracy version of bidiagonal SVD
Description Bidiagonal QR SVD provided by LAPACK has two version - high accuracy but slow one (TOL>0), and moderate accuracy but quick one (TOL<0). Quick version in some very rare circumstances fails to converge.

Currently it is unknown whether it is bug or intrinsic property of the algorithm. In order to make all SVD-dependent algorithms more stable quick version is silently replaced by the slower, but more robust one.
Additional Information
Programming language Unspecified
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- Issue History
Date Modified Username Field Change
2011-12-22 11:52 SergeyB New Issue
2011-12-22 11:52 SergeyB Status new => assigned
2011-12-22 11:52 SergeyB Assigned To => SergeyB
2011-12-22 11:52 SergeyB Programming language => Unspecified
2011-12-22 11:53 SergeyB Status assigned => resolved
2011-12-22 11:53 SergeyB Fixed in Version => 3.5.0
2011-12-22 11:53 SergeyB Resolution open => fixed

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