Suppose I've setup an eigenproblem in Fenics whose eigenvalues are purely real. Is there a way I can setup my SLEPc Eigensolver to retrieve only the eigenvalues whose magnitude lies between a given interval; say, lambda in [a,b], where a< b ?
I'm really not interested in the rest of the spectrum, and would prefer not to waste computational time solving for ALL the eigenvalues if I can obtain those in the narrow band [a,b] in less time. Is there currently a way (e.g. a SLEPc eigensolver solver parameter) to do this within the scope of Fenics?
