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 159566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 169566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 17*be096a46SBarry 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; 29c4762a1bSJed Brown i = 0; j = 0; 309566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 31c4762a1bSJed Brown 32c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 33c4762a1bSJed Brown i = 0; j = 2; 349566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 35c4762a1bSJed Brown 36c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 37c4762a1bSJed Brown i = 1; j = 0; 389566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 39c4762a1bSJed Brown 40c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 6; 41c4762a1bSJed Brown i = 1; j = 1; 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; 45c4762a1bSJed Brown i = 2; j = 0; 469566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 47c4762a1bSJed Brown 48c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 7; 49c4762a1bSJed Brown i = 2; j = 2; 509566063dSJacob Faibussowitsch PetscCall(MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES)); 51c4762a1bSJed Brown 529566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 539566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 549566063dSJacob Faibussowitsch PetscCall(MatView(A,fd)); 559566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 56c4762a1bSJed Brown 579566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_WORLD,12,&x)); 589566063dSJacob Faibussowitsch PetscCall(VecSet(x,one)); 599566063dSJacob Faibussowitsch PetscCall(VecView(x,fd)); 609566063dSJacob Faibussowitsch PetscCall(VecDestroy(&x)); 61c4762a1bSJed Brown 629566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&fd)); 639566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 64b122ec5aSJacob Faibussowitsch return 0; 65c4762a1bSJed Brown } 66