Thanks!
? 2012-07-11 22:19:51?"Jed Brown" <jedbrown at mcs.anl.gov> ???
On Wed, Jul 11, 2012 at 8:51 AM, w_ang_temp <w_ang_temp at 163.com> wrote:
Hello,
Is there function in PETSc for judging the properties of the matrix A ?
Such as positive definitiveness and
conditional number. I know that there are several functions begin with MatIs+,
but it has limited amounts.
The Ritz values are estimates of the eigenvalues that you can obtain using
KSPSolve() with -ksp_compute_eigenvalues or -ksp_plot_eigenvalues. Note that
these are estimates for the _preconditioned_ operator, so you should use
-pc_type none if you want estimates for the original operator.
http://www.mcs.anl.gov/petsc/documentation/faq.html#conditionnumber
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