1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves 4by4 block matrix.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6*d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 7*d71ae5a4SJacob Faibussowitsch { 8c4762a1bSJed Brown Mat A; 9c4762a1bSJed Brown PetscInt i, j; 10c4762a1bSJed Brown PetscMPIInt size; 11c4762a1bSJed Brown PetscViewer fd; 12c4762a1bSJed Brown PetscScalar values[16], one = 1.0; 13c4762a1bSJed Brown Vec x; 14c4762a1bSJed Brown 15327415f7SBarry Smith PetscFunctionBeginUser; 169566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 179566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 18be096a46SBarry Smith PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, m "Can only run on one processor"); 19c4762a1bSJed Brown 20c4762a1bSJed Brown /* 21c4762a1bSJed Brown Open binary file. Note that we use FILE_MODE_WRITE to indicate 22c4762a1bSJed Brown writing to this file. 23c4762a1bSJed Brown */ 249566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "4by4", FILE_MODE_WRITE, &fd)); 25c4762a1bSJed Brown 269566063dSJacob Faibussowitsch PetscCall(MatCreateSeqBAIJ(PETSC_COMM_WORLD, 4, 12, 12, 0, 0, &A)); 27c4762a1bSJed Brown 28c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 29c4762a1bSJed Brown for (i = 0; i < 4; i++) values[4 * i + i] += 5; 309371c9d4SSatish Balay i = 0; 319371c9d4SSatish Balay j = 0; 329566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 33c4762a1bSJed Brown 34c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 359371c9d4SSatish Balay i = 0; 369371c9d4SSatish Balay j = 2; 379566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 38c4762a1bSJed Brown 39c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 409371c9d4SSatish Balay i = 1; 419371c9d4SSatish Balay j = 0; 429566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 43c4762a1bSJed Brown 44c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 459371c9d4SSatish Balay for (i = 0; i < 4; i++) values[4 * i + i] += 6; 469371c9d4SSatish Balay i = 1; 479371c9d4SSatish Balay j = 1; 489566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 49c4762a1bSJed Brown 509371c9d4SSatish Balay for (i = 0; i < 16; i++) values[i] = i; 519371c9d4SSatish Balay i = 2; 529371c9d4SSatish Balay j = 0; 539371c9d4SSatish Balay PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 549371c9d4SSatish Balay 559371c9d4SSatish Balay for (i = 0; i < 16; i++) values[i] = i; 569371c9d4SSatish Balay for (i = 0; i < 4; i++) values[4 * i + i] += 7; 579371c9d4SSatish Balay i = 2; 589371c9d4SSatish Balay j = 2; 599566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 60c4762a1bSJed Brown 619566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 629566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 639566063dSJacob Faibussowitsch PetscCall(MatView(A, fd)); 649566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 65c4762a1bSJed Brown 669566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_WORLD, 12, &x)); 679566063dSJacob Faibussowitsch PetscCall(VecSet(x, one)); 689566063dSJacob Faibussowitsch PetscCall(VecView(x, fd)); 699566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 70c4762a1bSJed Brown 719566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 729566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 73b122ec5aSJacob Faibussowitsch return 0; 74c4762a1bSJed Brown } 75