[petsc-users] KrylovSchur solver diverges when setting EPS_GHEP

[Jose E. Roman]

El 07/11/2014, a las 15:19, Denis Davydov escribió:

> 
>> What do you mean by 'breaks convergence'? Are you sure your matrices are symmetric?
>> Jose
> 
> I mean the solver does not converge. 
> Whereas if I do not specify that the matrices are symmetric and 
> generalised non-symmetric eigenvalue problem is considered, everything is all right. 
> However, i am sure the matrices are symmetric. 
> I double check it with MatIsSymmetric. 
> 
> Regards,
> Denis.
> 

When solving as a symmetric problem, the solver uses B-inner products, so lengths are measured differently. Does your B-matrix have a large norm? Why are you using the absolute convergence criterion? Try with -eps_conv_eig or -eps_conv_norm
If this does not solve the problem, send me a small matrix that I can try.
Jose