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 PetscErrorCode ierr; 11c4762a1bSJed Brown PetscMPIInt size; 12c4762a1bSJed Brown PetscViewer fd; 13c4762a1bSJed Brown PetscScalar values[16],one = 1.0; 14c4762a1bSJed Brown Vec x; 15c4762a1bSJed Brown 16c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 17ffc4695bSBarry Smith ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 18*2c71b3e2SJacob Faibussowitsch PetscCheckFalse(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 */ 24c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"4by4",FILE_MODE_WRITE,&fd);CHKERRQ(ierr); 25c4762a1bSJed Brown 26c4762a1bSJed Brown ierr = MatCreateSeqBAIJ(PETSC_COMM_WORLD,4,12,12,0,0,&A);CHKERRQ(ierr); 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; 31c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 32c4762a1bSJed Brown 33c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 34c4762a1bSJed Brown i = 0; j = 2; 35c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 36c4762a1bSJed Brown 37c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 38c4762a1bSJed Brown i = 1; j = 0; 39c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 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; 43c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 44c4762a1bSJed Brown 45c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 46c4762a1bSJed Brown i = 2; j = 0; 47c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 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; 51c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 52c4762a1bSJed Brown 53c4762a1bSJed Brown ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 54c4762a1bSJed Brown ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 55c4762a1bSJed Brown ierr = MatView(A,fd);CHKERRQ(ierr); 56c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 57c4762a1bSJed Brown 58c4762a1bSJed Brown ierr = VecCreateSeq(PETSC_COMM_WORLD,12,&x);CHKERRQ(ierr); 59c4762a1bSJed Brown ierr = VecSet(x,one);CHKERRQ(ierr); 60c4762a1bSJed Brown ierr = VecView(x,fd);CHKERRQ(ierr); 61c4762a1bSJed Brown ierr = VecDestroy(&x);CHKERRQ(ierr); 62c4762a1bSJed Brown 63c4762a1bSJed Brown ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 64c4762a1bSJed Brown ierr = PetscFinalize(); 65c4762a1bSJed Brown return ierr; 66c4762a1bSJed Brown } 67