1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves 4by4 block matrix.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6*9371c9d4SSatish Balay int main(int argc, char **args) { 7c4762a1bSJed Brown Mat A; 8c4762a1bSJed Brown PetscInt i, j; 9c4762a1bSJed Brown PetscMPIInt size; 10c4762a1bSJed Brown PetscViewer fd; 11c4762a1bSJed Brown PetscScalar values[16], one = 1.0; 12c4762a1bSJed Brown Vec x; 13c4762a1bSJed Brown 14327415f7SBarry Smith PetscFunctionBeginUser; 159566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 169566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 17be096a46SBarry Smith PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, m "Can only run on one processor"); 18c4762a1bSJed Brown 19c4762a1bSJed Brown /* 20c4762a1bSJed Brown Open binary file. Note that we use FILE_MODE_WRITE to indicate 21c4762a1bSJed Brown writing to this file. 22c4762a1bSJed Brown */ 239566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "4by4", FILE_MODE_WRITE, &fd)); 24c4762a1bSJed Brown 259566063dSJacob Faibussowitsch PetscCall(MatCreateSeqBAIJ(PETSC_COMM_WORLD, 4, 12, 12, 0, 0, &A)); 26c4762a1bSJed Brown 27c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 28c4762a1bSJed Brown for (i = 0; i < 4; i++) values[4 * i + i] += 5; 29*9371c9d4SSatish Balay i = 0; 30*9371c9d4SSatish Balay j = 0; 319566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 32c4762a1bSJed Brown 33c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 34*9371c9d4SSatish Balay i = 0; 35*9371c9d4SSatish Balay j = 2; 369566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 37c4762a1bSJed Brown 38c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 39*9371c9d4SSatish Balay i = 1; 40*9371c9d4SSatish Balay j = 0; 419566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 42c4762a1bSJed Brown 43c4762a1bSJed Brown for (i = 0; i < 16; i++) values[i] = i; 44*9371c9d4SSatish Balay for (i = 0; i < 4; i++) values[4 * i + i] += 6; 45*9371c9d4SSatish Balay i = 1; 46*9371c9d4SSatish Balay j = 1; 479566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 48c4762a1bSJed Brown 49*9371c9d4SSatish Balay for (i = 0; i < 16; i++) values[i] = i; 50*9371c9d4SSatish Balay i = 2; 51*9371c9d4SSatish Balay j = 0; 52*9371c9d4SSatish Balay PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 53*9371c9d4SSatish Balay 54*9371c9d4SSatish Balay for (i = 0; i < 16; i++) values[i] = i; 55*9371c9d4SSatish Balay for (i = 0; i < 4; i++) values[4 * i + i] += 7; 56*9371c9d4SSatish Balay i = 2; 57*9371c9d4SSatish Balay j = 2; 589566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A, 1, &i, 1, &j, values, INSERT_VALUES)); 59c4762a1bSJed Brown 609566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 619566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 629566063dSJacob Faibussowitsch PetscCall(MatView(A, fd)); 639566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 64c4762a1bSJed Brown 659566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_WORLD, 12, &x)); 669566063dSJacob Faibussowitsch PetscCall(VecSet(x, one)); 679566063dSJacob Faibussowitsch PetscCall(VecView(x, fd)); 689566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 69c4762a1bSJed Brown 709566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 719566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 72b122ec5aSJacob Faibussowitsch return 0; 73c4762a1bSJed Brown } 74