10 September 2023 10:21:16 AM UMFPACK_WATHEN: C++ version Use UMFPACK to solve a sparse linear system A*x=b. Number of ST values = 576 Number of CC values = 472 L2 error ||X1 - X2||: inf UMFPACK_SIMPLE: Normal end of execution. 10 September 2023 10:21:16 AM