1d8606c27SBarry Smith! 2d8606c27SBarry Smith! This program demonstrates use of MatCreateSubMatrices() from Fortran 3d8606c27SBarry Smith! 4d8606c27SBarry Smithprogram main 5d8606c27SBarry Smith#include <petsc/finclude/petscmat.h> 6d8606c27SBarry Smith use petscmat 7d8606c27SBarry Smith implicit none 8d8606c27SBarry Smith 9ce78bad3SBarry Smith Mat A 10ce78bad3SBarry Smith Mat, pointer :: B(:) 11d8606c27SBarry Smith PetscErrorCode ierr 12d8606c27SBarry Smith PetscInt nis, zero(1) 13d8606c27SBarry Smith PetscViewer v 14d8606c27SBarry Smith IS isrow 15d8606c27SBarry Smith PetscMPIInt rank 16d8606c27SBarry Smith 17d8606c27SBarry Smith PetscCallA(PetscInitialize(ierr)) 18d8606c27SBarry Smith PetscCallMPIA(MPI_Comm_rank(PETSC_COMM_WORLD, rank, ierr)) 19d8606c27SBarry Smith 20d8606c27SBarry Smith#if defined(PETSC_USE_64BIT_INDICES) 21d8606c27SBarry Smith PetscCallA(PetscViewerBinaryOpen(PETSC_COMM_WORLD, '${PETSC_DIR}/share/petsc/datafiles/matrices/'//'ns-real-int64-float64', FILE_MODE_READ, v, ierr)) 22d8606c27SBarry Smith#else 23d8606c27SBarry Smith PetscCallA(PetscViewerBinaryOpen(PETSC_COMM_WORLD, '${PETSC_DIR}/share/petsc/datafiles/matrices/'//'ns-real-int32-float64', FILE_MODE_READ, v, ierr)) 24d8606c27SBarry Smith#endif 25d8606c27SBarry Smith 26d8606c27SBarry Smith PetscCallA(MatCreate(PETSC_COMM_WORLD, A, ierr)) 27d8606c27SBarry Smith PetscCallA(MatSetType(A, MATAIJ, ierr)) 28d8606c27SBarry Smith PetscCallA(MatLoad(A, v, ierr)) 29d8606c27SBarry Smith 30d8606c27SBarry Smith nis = 1 31d8606c27SBarry Smith zero(1) = 0 32*4820e4eaSBarry Smith if (rank == 1) then 33d8606c27SBarry Smith nis = 0 ! test nis = 0 34d8606c27SBarry Smith end if 35d8606c27SBarry Smith PetscCallA(ISCreateGeneral(PETSC_COMM_SELF, nis, zero, PETSC_COPY_VALUES, isrow, ierr)) 36d8606c27SBarry Smith 37ce78bad3SBarry Smith PetscCallA(MatCreateSubmatrices(A, nis, [isrow], [isrow], MAT_INITIAL_MATRIX, B, ierr)) 38d8606c27SBarry Smith 39*4820e4eaSBarry Smith if (rank == 0) then 40d8606c27SBarry Smith PetscCallA(MatView(B(1), PETSC_VIEWER_STDOUT_SELF, ierr)) 41d8606c27SBarry Smith end if 42d8606c27SBarry Smith 43ce78bad3SBarry Smith PetscCallA(MatCreateSubmatrices(A, nis, [isrow], [isrow], MAT_REUSE_MATRIX, B, ierr)) 44d8606c27SBarry Smith 45*4820e4eaSBarry Smith if (rank == 0) then 46d8606c27SBarry Smith PetscCallA(MatView(B(1), PETSC_VIEWER_STDOUT_SELF, ierr)) 47d8606c27SBarry Smith end if 48d8606c27SBarry Smith 49d8606c27SBarry Smith PetscCallA(ISDestroy(isrow, ierr)) 50d8606c27SBarry Smith PetscCallA(MatDestroy(A, ierr)) 51d8606c27SBarry Smith PetscCallA(MatDestroySubMatrices(nis, B, ierr)) 52d8606c27SBarry Smith PetscCallA(PetscViewerDestroy(v, ierr)) 53d8606c27SBarry Smith 54d8606c27SBarry Smith PetscCallA(PetscFinalize(ierr)) 55d8606c27SBarry Smithend 56d8606c27SBarry Smith 57d8606c27SBarry Smith!/*TEST 58d8606c27SBarry Smith! 59d8606c27SBarry Smith! test: 60d8606c27SBarry Smith! requires: double !complex 61d8606c27SBarry Smith! 62d8606c27SBarry Smith!TEST*/ 63