SVD - Singular Value Decomposition 14-FEB-2017
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02-08-2016, 03:13 PM
Post: #7
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RE: SVD - Singular Value Decomposition
(10-21-2015 06:20 PM)Werner Wrote: The 48/49 use the older LINPACK version (but without the shift calculation bug) that does not have the zero-shift QR nor bulge chasing in two directions, and different (simpler - too simple in some cases) convergence criteria. Well there goes my memory. The 48/49/50 use the LAPACK version, as well. How can you know? 1. look at the source code, or: 2. calculate the SVD of Code:
When the smallest singular value is about a^3, the LAPACK code is used. When it's a^2/SQRT(2), the LINPACK code is used. (the LINPACK code would set the offdiagonal a to zero since the convergence test used is 1 + 1 + a = 1 + 1 (adding the neighbouring diagonal elements) Cheers, Werner 41CV†,42S,48GX,49G,DM42,DM41X,17BII,15CE,DM15L,12C,16CE |
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