1*c4762a1bSJed Brown 2*c4762a1bSJed Brown static char help[] = "Saves 4by4 block matrix.\n\n"; 3*c4762a1bSJed Brown 4*c4762a1bSJed Brown #include <petscmat.h> 5*c4762a1bSJed Brown 6*c4762a1bSJed Brown int main(int argc,char **args) 7*c4762a1bSJed Brown { 8*c4762a1bSJed Brown Mat A; 9*c4762a1bSJed Brown PetscInt i,j; 10*c4762a1bSJed Brown PetscErrorCode ierr; 11*c4762a1bSJed Brown PetscMPIInt size; 12*c4762a1bSJed Brown PetscViewer fd; 13*c4762a1bSJed Brown PetscScalar values[16],one = 1.0; 14*c4762a1bSJed Brown Vec x; 15*c4762a1bSJed Brown 16*c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 17*c4762a1bSJed Brown ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 18*c4762a1bSJed Brown if (size > 1) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,m"Can only run on one processor"); 19*c4762a1bSJed Brown 20*c4762a1bSJed Brown /* 21*c4762a1bSJed Brown Open binary file. Note that we use FILE_MODE_WRITE to indicate 22*c4762a1bSJed Brown writing to this file. 23*c4762a1bSJed Brown */ 24*c4762a1bSJed Brown ierr = PetscViewerBinaryOpen(PETSC_COMM_WORLD,"4by4",FILE_MODE_WRITE,&fd);CHKERRQ(ierr); 25*c4762a1bSJed Brown 26*c4762a1bSJed Brown ierr = MatCreateSeqBAIJ(PETSC_COMM_WORLD,4,12,12,0,0,&A);CHKERRQ(ierr); 27*c4762a1bSJed Brown 28*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 29*c4762a1bSJed Brown for (i=0; i<4; i++) values[4*i+i] += 5; 30*c4762a1bSJed Brown i = 0; j = 0; 31*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 32*c4762a1bSJed Brown 33*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 34*c4762a1bSJed Brown i = 0; j = 2; 35*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 36*c4762a1bSJed Brown 37*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 38*c4762a1bSJed Brown i = 1; j = 0; 39*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 40*c4762a1bSJed Brown 41*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 6; 42*c4762a1bSJed Brown i = 1; j = 1; 43*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 44*c4762a1bSJed Brown 45*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i; 46*c4762a1bSJed Brown i = 2; j = 0; 47*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 48*c4762a1bSJed Brown 49*c4762a1bSJed Brown for (i=0; i<16; i++) values[i] = i;for (i=0; i<4; i++) values[4*i+i] += 7; 50*c4762a1bSJed Brown i = 2; j = 2; 51*c4762a1bSJed Brown ierr = MatSetValuesBlocked(A,1,&i,1,&j,values,INSERT_VALUES);CHKERRQ(ierr); 52*c4762a1bSJed Brown 53*c4762a1bSJed Brown ierr = MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 54*c4762a1bSJed Brown ierr = MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 55*c4762a1bSJed Brown ierr = MatView(A,fd);CHKERRQ(ierr); 56*c4762a1bSJed Brown ierr = MatDestroy(&A);CHKERRQ(ierr); 57*c4762a1bSJed Brown 58*c4762a1bSJed Brown ierr = VecCreateSeq(PETSC_COMM_WORLD,12,&x);CHKERRQ(ierr); 59*c4762a1bSJed Brown ierr = VecSet(x,one);CHKERRQ(ierr); 60*c4762a1bSJed Brown ierr = VecView(x,fd);CHKERRQ(ierr); 61*c4762a1bSJed Brown ierr = VecDestroy(&x);CHKERRQ(ierr); 62*c4762a1bSJed Brown 63*c4762a1bSJed Brown ierr = PetscViewerDestroy(&fd);CHKERRQ(ierr); 64*c4762a1bSJed Brown ierr = PetscFinalize(); 65*c4762a1bSJed Brown return ierr; 66*c4762a1bSJed Brown } 67