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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 Platform
Status resolved   OS
Projection none   OS Version
ETA none Fixed in Version 3.5.0 Product Version
  Target Version Product Build
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.
Steps To Reproduce
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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