1 2 static char help[] = "Tests MatCreateSubmatrix() with entire matrix, modified from ex59.c."; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **args) 7 { 8 Mat C,A,Adup; 9 PetscInt i,j,m = 3,n = 2,rstart,rend; 10 PetscMPIInt size,rank; 11 PetscErrorCode ierr; 12 PetscScalar v; 13 IS isrow; 14 PetscBool detect_bug = PETSC_FALSE; 15 16 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 17 ierr = PetscOptionsHasName(NULL,NULL,"-detect_bug",&detect_bug);CHKERRQ(ierr); 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 ierr = MatCreate(PETSC_COMM_WORLD,&C);CHKERRQ(ierr); 23 ierr = MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n);CHKERRQ(ierr); 24 ierr = MatSetFromOptions(C);CHKERRQ(ierr); 25 ierr = MatSetUp(C);CHKERRQ(ierr); 26 27 /* 28 This is JUST to generate a nice test matrix, all processors fill up 29 the entire matrix. This is not something one would ever do in practice. 30 */ 31 ierr = MatGetOwnershipRange(C,&rstart,&rend);CHKERRQ(ierr); 32 for (i=rstart; i<rend; i++) { 33 for (j=0; j<m*n; j++) { 34 v = i + j + 1; 35 ierr = MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 36 } 37 } 38 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 39 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 40 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);CHKERRQ(ierr); 41 ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 42 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 43 44 /* 45 Generate a new matrix consisting every row and column of the original matrix 46 */ 47 ierr = MatGetOwnershipRange(C,&rstart,&rend);CHKERRQ(ierr); 48 49 /* Create parallel IS with the rows we want on THIS processor */ 50 if (detect_bug && !rank) { 51 ierr = ISCreateStride(PETSC_COMM_WORLD,1,rstart,1,&isrow);CHKERRQ(ierr); 52 } else { 53 ierr = ISCreateStride(PETSC_COMM_WORLD,rend-rstart,rstart,1,&isrow);CHKERRQ(ierr); 54 } 55 ierr = MatCreateSubMatrix(C,isrow,NULL,MAT_INITIAL_MATRIX,&A);CHKERRQ(ierr); 56 57 /* Change C to test the case MAT_REUSE_MATRIX */ 58 if (!rank) { 59 i = 0; j = 0; v = 100; 60 ierr = MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 61 } 62 ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 63 ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 64 65 ierr = MatCreateSubMatrix(C,isrow,NULL,MAT_REUSE_MATRIX,&A);CHKERRQ(ierr); 66 ierr = PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON);CHKERRQ(ierr); 67 ierr = MatView(A,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 68 ierr = PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 69 70 /* Test MatDuplicate */ 71 ierr = MatDuplicate(A,MAT_COPY_VALUES,&Adup);CHKERRQ(ierr); 72 ierr = MatDestroy(&Adup);CHKERRQ(ierr); 73 74 ierr = ISDestroy(&isrow);CHKERRQ(ierr); 75 ierr = MatDestroy(&A);CHKERRQ(ierr); 76 ierr = MatDestroy(&C);CHKERRQ(ierr); 77 ierr = PetscFinalize(); 78 return ierr; 79 } 80 81 82 /*TEST 83 84 test: 85 nsize: 2 86 filter: grep -v "Mat Object" 87 requires: !complex 88 89 test: 90 suffix: 2 91 nsize: 3 92 args: -detect_bug 93 filter: grep -v "Mat Object" 94 requires: !complex 95 96 TEST*/ 97