El 13/02/2015, a las 15:06, Krzysztof Gawarecki escribió: > Dear All, > > I'm calculating eigenvalues and eigenvectors of the matrix which has specific > kind of symmetry. > Due to this symmetry I obtain the eigenvalues which are doubly degenerated. > So eg. eigeinvalue 'e1' has eigenvectors 'a1' and 'b1'. These eigenvectors > are related to each other by the relation a1 = T b1, where T is a matrix > (given for my problem). > So it is enough to calculate only one eigenvector for each eigenvalue (and > the second one can be calculated by matvec operation). This situation has > been described in http://dl.acm.org/citation.cfm?id=2494747. > > How could I take advantage on this in EPSSolve in Jacobi-Davidson method? > Could I add two vectors to the subspace (the second one would be calculated > by multiplying the first one by matrix T) in every iteration? Should I modify > function "dvd_updateV_update_gen" in dvd_updatev.c ? > > I would be very grateful for any suggestion. > > Krzysztof >
We do not provide a flexible way for user-provided subspace expansions, so yes you can try this route by modifying that function yourself. Sent an email to slepc-maint if you get stuck. Jose
