1 2 static char help[] = "Tests MatGetColumnVector()."; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C; 9 PetscInt i,j,m = 3,n = 2,Ii,J,col = 0; 10 PetscMPIInt size,rank; 11 PetscErrorCode ierr; 12 PetscScalar v; 13 Vec yy; 14 15 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 16 ierr = PetscOptionsGetInt(NULL,NULL,"-col",&col,NULL);CHKERRQ(ierr); 17 18 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 19 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 20 n = 2*size; 21 22 /* create the matrix for the five point stencil, YET AGAIN*/ 23 ierr = MatCreate(PETSC_COMM_WORLD,&C);CHKERRQ(ierr); 24 ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 25 ierr = MatSetFromOptions(C);CHKERRQ(ierr); 26 ierr = MatSeqAIJSetPreallocation(C,5,NULL);CHKERRQ(ierr); 27 ierr = MatMPIAIJSetPreallocation(C,5,NULL,5,NULL);CHKERRQ(ierr); 28 ierr = MatSetUp(C);CHKERRQ(ierr); 29 30 for (i=0; i<m; i++) { 31 for (j=2*rank; j<2*rank+2; j++) { 32 v = -1.0; Ii = j + n*i; 33 if (i>0) {J = Ii - n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 34 if (i<m-1) {J = Ii + n; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 35 if (j>0) {J = Ii - 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 36 if (j<n-1) {J = Ii + 1; ierr = MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);CHKERRQ(ierr);} 37 v = 4.0; ierr = MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);CHKERRQ(ierr); 38 } 39 } 40 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 41 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 42 ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 43 44 ierr = VecCreate(PETSC_COMM_WORLD,&yy);CHKERRQ(ierr); 45 ierr = VecSetSizes(yy,PETSC_DECIDE,m*n);CHKERRQ(ierr); 46 ierr = VecSetFromOptions(yy);CHKERRQ(ierr); 47 48 ierr = MatGetColumnVector(C,yy,col);CHKERRQ(ierr); 49 50 ierr = VecView(yy,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 51 52 ierr = VecDestroy(&yy);CHKERRQ(ierr); 53 ierr = MatDestroy(&C);CHKERRQ(ierr); 54 ierr = PetscFinalize(); 55 return ierr; 56 } 57 58 59 /*TEST 60 61 test: 62 nsize: 3 63 args: -col 7 64 65 test: 66 suffix: dense 67 nsize: 3 68 args: -col 7 -mat_type dense 69 70 TEST*/ 71