kwant.solvers.sparse – Basic sparse matrix solver

This solver uses SciPy’s scipy.sparse.linalg. The interface is identical to that of the default solver.

scipy.sparse.linalg currently uses internally either the direct sparse solver UMFPACK or if that is not installed, SuperLU. Often, SciPy’s SuperLU will give quite poor performance and you will be warned if only SuperLU is found. The module variable uses_umfpack can be checked to determine if UMFPACK is being used.