10 September 2023 10:21:16 AM UMFPACK_WEST: C++ version Use UMFPACK to solve the sparse linear system A*x=b. The matrix A is stored, in CC format, in 3 files. Residual: ||A*x-b|| = 2.51341e-15 UMFPACK_WEST: Normal end of execution. 10 September 2023 10:21:16 AM