[petsc-users] The condition number

w_ang_temp w_ang_temp at 163.com
Tue Feb 5 13:27:57 CST 2013


Hello,
I want to get the condition number of the matrix. I use the command:
 mpiexec -n 1 ./ex4f -ksp_type gmres -pc_type none -ksp_monitor_singular_value -ksp_gmres_restart 10000
The information is:
287 KSP Residual norm 2.709682524692e-05 % max 2.926321440259e+04 min 5.402536868919e-01 max/min 5.416569125321e+04
288 KSP Residual norm 2.519306234382e-05 % max 2.926321440259e+04 min 5.266603977255e-01 max/min 5.556372669936e+04
289 KSP Residual norm 2.378149039323e-05 % max 2.926321440259e+04 min 5.172748873301e-01 max/min 5.657188299559e+04
290 KSP Residual norm 2.287472821678e-05 % max 2.926321440260e+04 min 5.115884179685e-01 max/min 5.720069762095e+04
291 KSP Residual norm 2.228155716304e-05 % max 2.926321440260e+04 min 5.080217090257e-01 max/min 5.760229116728e+04
292 KSP Residual norm 2.192114571943e-05 % max 2.926321440260e+04 min 5.059182789026e-01 max/min 5.784178121826e+04
293 KSP Residual norm 2.167188877219e-05 % max 2.926321440260e+04 min 5.044948817455e-01 max/min 5.800497777371e+04
294 KSP Residual norm 2.148234628716e-05 % max 2.926321440260e+04 min 5.034325309589e-01 max/min 5.812738073732e+04
295 KSP Residual norm 2.132127329266e-05 % max 2.926321440260e+04 min 5.025455984087e-01 max/min 5.822996857452e+04
296 KSP Residual norm 2.113112645062e-05 % max 2.926321440260e+04 min 5.015166226585e-01 max/min 5.834944063764e+04
Linear solve converged due to CONVERGED_RTOL iterations 296
 
So is the condition number: max/min 5.834944063764e+04? The value of the last iteration?
Thanks.
                                             Jim
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130206/5cc4cd6b/attachment.html>


More information about the petsc-users mailing list