how to get all the singular values of the matrix?

[Yujie]

Hi, everyone

I want to select iterative methods by observing the singular values
decompostion of the matrix. However, I don't know how to get all the
singular values of the matrix in PETSc. I know the command
"-ksp_monitor_singular_value" may get the max and min singular values at
each iteration. How to get the singular values of the matrix I want to
solve? In addition, when I use the preconditioned iterative method, how to
get the singular values of the preconditioned iterative operator?

thanks a lot.

Regards,
Yujie
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