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Inconsistent EigenVectors on running same problem multiple times

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Rehan Rehan
Rehan Rehan 2016-1-9
评论： Steven Lord 2016-1-11
Hi All,
In my FEM code, I run EIG or EIGS command for getting eigenvalues and eigenvectors. Strangely, it is returning different eigenvectors that are inconsistent each time for the same code and same inputs.
Any help will be appreciated.
Best regards,

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回答（1 个）

Walter Roberson
Walter Roberson 2016-1-9
If I recall, a few weeks ago someone mentioned that there is a random initialization going on (might have been by at the qr level.) Try setting the random seed, trying, setting it again, see if you get the same results.
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Guillaume
Guillaume 2016-1-11
No, as has been said, you can fix the seed of RNG to the same number before each time you call eigs, so that the 'random' number it uses is always the same and thus, always returns the same result.
As per Walter's later comment:
rng(12345); %use any seed you want
[A1,B1] = eigs(KM,20,'sm');
rng(12345); %as long as it's always the same
[A2,B2] = eigs(KM,20,'sm');
Steven Lord
Steven Lord 2016-1-11
Or set the v0 option in your EIGS call to fix the starting vector. By default, it is randomly generated.

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