#11248: SVD matrix decomposition may return a non-invertible "unitary" matrix
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Reporter: rbeezer | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.7
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by kcrisman):
{{{
Last login: Thu Apr 21 15:18:29 on ttyp4
Welcome to Darwin!
Dasher-03:~ student$ cd Desktop/
Dasher-03:~/Desktop student$ gcc test_zgesdd.c -o test_zgesdd -framework
Accelerate
Dasher-03:~/Desktop student$ ./test_zgesdd
ZGESDD Example Program Results
Singular values
21.76 16.60 3.97
Left singular vectors (stored columnwise)
( 0.55, 0.00) ( 0.76, 0.00) ( -0.34, 0.00)
( -0.04, -0.15) ( 0.27, -0.23) ( 0.55, -0.74)
( 0.81, 0.12) ( -0.52, -0.14) ( 0.13, -0.11)
Right singular vectors (stored rowwise)
( 0.23, 0.21) ( 0.37, 0.39) ( 0.24, 0.33) ( -0.56, -0.37)
( -0.58, 0.40) ( 0.11, 0.17) ( 0.60, -0.27) ( 0.16, 0.06)
( 0.60, 0.12) ( -0.19, 0.30) ( 0.39, 0.20) ( 0.45, 0.31)
}}}
With the change
{{{
Dasher-03:~/Desktop student$ gcc test_zgesdd1.c -o test_zgesdd1 -framework
Accelerate
Dasher-03:~/Desktop student$ ./test_zgesdd1
ZGESDD Example Program Results
Singular values
21.76 16.60 3.97
Left singular vectors (stored columnwise)
( 0.55, 0.00) ( 0.76, 0.00) ( -0.34, 0.00)
( -0.04, -0.15) ( 0.27, -0.23) ( 0.55, -0.74)
( 0.81, 0.12) ( -0.52, -0.14) ( 0.13, -0.11)
Right singular vectors (stored rowwise)
( 0.23, 0.21) ( 0.37, 0.39) ( 0.24, 0.33) ( -0.56, -0.37)
( -0.58, 0.40) ( 0.11, 0.17) ( 0.60, -0.27) ( 0.16, 0.06)
( 0.60, 0.12) ( -0.19, 0.30) ( 0.39, 0.20) ( 0.45, 0.31)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11248#comment:23>
Sage <http://www.sagemath.org>
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