scqubits.core.diag.evals_primme_sparse¶

scqubits.core.diag.evals_primme_sparse(matrix, evals_count, **kwargs)[source]¶

Diagonalization based on primme’s (sparse) eigsh function. Only evals are returned.

Requires that the primme library is installed.

Parameters:

matrix (Union[ndarray, csc_matrix, Qobj]) – ndarray or qutip.Qobj to be diagonalized
evals_count (int) – how many eigenvalues/vectors should be returned
kwargs – optional settings that are passed onto the diagonalization routine

Return type:

ndarray

Returns:

eigenvalues of matrix