[petsc-users] EVP Solutions with Subspace

Jose E. Roman jroman at dsic.upv.es
Fri Apr 5 11:47:03 CDT 2013

El 05/04/2013, a las 18:43, Sonya Blade escribió:

>> http://www.grycap.upv.es/slepc/documentation/current/docs/manualpages/EPS/EPSSetDimensions.html
>> http://www.grycap.upv.es/slepc/documentation/current/docs/manualpages/EPS/EPSSetWhichEigenpairs.html
>> For these simple questions it is faster to look for the answer in the manual.
>> Jose
> Sorry for that Jose,
> The last message I received says that:
> [0]PETSC ERROR:   !
> [0]PETSC ERROR: KSP did not converge (reason=DIVERGED_ITS)!
> What could be the reason of not convergence, due to the fact that B matrix has 
> some zero values on its diagonal? Is there any other methods which solves GEP 
> even if there is zeros on diagonals?
> Regards, 		 	   		  

By default SLEPc uses a direct solver, so you would not get this message. Which options are you using for the KSP?


More information about the petsc-users mailing list