[petsc-users] Generalized eigenvalue problem using quad precision

Jose E. Roman jroman at dsic.upv.es
Sun Mar 4 15:12:26 CST 2018

Why do you want to move to quad precision? Double precision is usually enough.
The fact that B is singular should not be a problem, provided that you do shift-and-invert with a nonzero target value.
Can you send the output of -eps_view so that I can get a better idea what you are doing?


> El 5 mar 2018, a las 0:50, Santiago Andres Triana <repepo at gmail.com> escribió:
> Dear all,
> A rather general question, is there any possibility of solving a complex-valued generalized eigenvalue problem using quad (or extended) precision when the 'B' matrix is singular? So far I have been using MUMPS with double precision with good results but I require eventually extended precision. Any comment or advice highly welcome. Thanks in advance!
> Santiago

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