[petsc-users] understanding the eigenvalues of my system

[Zou (Non-US), Ling]

Dear All,

I just explored the user manual v3.4 and I noticed the option

-ksp_compute_eigenvalues

I test it with my problem with ~1000 number of dofs, and it printed out

Iteratively computed eigenvalues
0.840692 + 0i
0.857247 - 0.235747i
0.857247 + 0.235747i
0.999993 + 0i
1.03457 + 0i
2.69763 + 0i

I noticed there are complex numbers... I wonder what does the printout info
indicate, a good system, a bad system or nothing special?


Best,

Ling
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