On Tue, Oct 11, 2011 at 11:13 AM, behzad baghapour < behzad.baghapour at gmail.com> wrote:
> Okey. I checked the condition number "max/min". > It increases significantly in each ksp iterations!!! > The approximation is becoming better. The condition number is harder to actually compute than the solution. Bottom line: You have a hard problem. Iterative methods do not work on hard problems without specialized preconditioners. I recommend a literature search on solvers for your equations. Matt > Is it correct when the Jacobian matrix is fixed for each ksp iterations or > it is due to my fault? > > On Tue, Oct 11, 2011 at 7:28 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote: > >> On Tue, Oct 11, 2011 at 10:55, behzad baghapour < >> behzad.baghapour at gmail.com> wrote: >> >>> OK. Then how I can calculate and monitor the "condition number" in ksp? >> >> >> -ksp_monitor_singular_value >> > > > > -- > ================================== > Behzad Baghapour > Ph.D. Candidate, Mechecanical Engineering > University of Tehran, Tehran, Iran > https://sites.google.com/site/behzadbaghapour > Fax: 0098-21-88020741 > ================================== > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111011/848da0d9/attachment-0001.htm>
