Hi
We're getting different results for an eigenvector in Sage 5.11 and Sage
5.12. We think 5.11 is the correct answer and 5.12 has flipped the values
to negative.
sage@hummingbird-lan:~$ cat eigenbug.sage
A=matrix(RDF,[[0, 1/2, 1/3, 0, 0], \
[1/2, 0, 0, 1/3, 0], \
[1/2, 0, 0, 1/3, 1/2], \
[0, 1/2, 1/3, 0, 1/2], \
[0, 0, 1/3, 1/3, 0]]);
print A.eigenvectors_right()[0][1][0]
sage@hummingbird-lan:~$ sage --version
Sage Version 5.12, Release Date: 2013-10-07
sage@hummingbird-lan:~$ sage eigenbug.sage
(-0.36514837167, -0.36514837167, -0.547722557505, -0.547722557505,
-0.36514837167)
sage@hummingbird-lan:~$ ./src/sage-5.11/sage --version
Sage Version 5.11, Release Date: 2013-08-13
sage@hummingbird-lan:~$ ./src/sage-5.11/sage eigenbug.sage
(0.36514837167, 0.36514837167, 0.547722557505, 0.547722557505,
0.36514837167)
sage@hummingbird-lan:~$
Regards,
Evans
--
http://users.aims.ac.za/~evans
Evans Doe Ocansey
Tutor
Africa Institute for Mathematical Sciences
South Africa
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