[petsc-users] Generalized eigenvalue problem using quad precision

[Jose E. Roman]

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?

Jose


> 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