I have a large Hermitian sparse matrix, and I'd like to get a few of the eigenvalues with the smallest magnitude. I'm using the "eigs" function in Arpack however I get this error message:
ZeroPivotException: factorization encountered one or more zero pivots. Consider switching to a pivoted LU factorization.
Does anyone know how to get around this error? Is it possible to add an argument to eigs to use pivoted LU factorization instead?