1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves 4by4 block matrix.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6c4762a1bSJed Brown int main(int argc,char **args) 7c4762a1bSJed Brown { 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 15*327415f7SBarry 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; 30c4762a1bSJed Brown i = 0; 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; 34c4762a1bSJed Brown i = 0; j = 2; 359566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 36c4762a1bSJed Brown 37c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 38c4762a1bSJed Brown i = 1; j = 0; 399566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 40c4762a1bSJed Brown 41c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 6; 42c4762a1bSJed Brown i = 1; j = 1; 439566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 44c4762a1bSJed Brown 45c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 46c4762a1bSJed Brown i = 2; j = 0; 479566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 48c4762a1bSJed Brown 49c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 7; 50c4762a1bSJed Brown i = 2; j = 2; 519566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 52c4762a1bSJed Brown 539566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 549566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 559566063dSJacob Faibussowitsch PetscCall(MatView(A,fd)); 569566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 57c4762a1bSJed Brown 589566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_WORLD,12,&x)); 599566063dSJacob Faibussowitsch PetscCall(VecSet(x,one)); 609566063dSJacob Faibussowitsch PetscCall(VecView(x,fd)); 619566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 62c4762a1bSJed Brown 639566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 649566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 65b122ec5aSJacob Faibussowitsch return 0; 66c4762a1bSJed Brown } 67