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 PetscScalar v; 12 IS isrow; 13 PetscBool detect_bug = PETSC_FALSE; 14 15 PetscFunctionBeginUser; 16 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 17 PetscCall(PetscOptionsHasName(NULL,NULL,"-detect_bug",&detect_bug)); 18 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 19 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 20 n = 2*size; 21 22 PetscCall(MatCreate(PETSC_COMM_WORLD,&C)); 23 PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 24 PetscCall(MatSetFromOptions(C)); 25 PetscCall(MatSetUp(C)); 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 PetscCall(MatGetOwnershipRange(C,&rstart,&rend)); 32 for (i=rstart; i<rend; i++) { 33 for (j=0; j<m*n; j++) { 34 v = i + j + 1; 35 PetscCall(MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES)); 36 } 37 } 38 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 39 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 40 PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON)); 41 PetscCall(MatView(C,PETSC_VIEWER_STDOUT_WORLD)); 42 PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD)); 43 44 /* 45 Generate a new matrix consisting every row and column of the original matrix 46 */ 47 PetscCall(MatGetOwnershipRange(C,&rstart,&rend)); 48 49 /* Create parallel IS with the rows we want on THIS processor */ 50 if (detect_bug && rank == 0) { 51 PetscCall(ISCreateStride(PETSC_COMM_WORLD,1,rstart,1,&isrow)); 52 } else { 53 PetscCall(ISCreateStride(PETSC_COMM_WORLD,rend-rstart,rstart,1,&isrow)); 54 } 55 PetscCall(MatCreateSubMatrix(C,isrow,NULL,MAT_INITIAL_MATRIX,&A)); 56 57 /* Change C to test the case MAT_REUSE_MATRIX */ 58 if (rank == 0) { 59 i = 0; j = 0; v = 100; 60 PetscCall(MatSetValues(C,1,&i,1,&j,&v,INSERT_VALUES)); 61 } 62 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 63 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 64 65 PetscCall(MatCreateSubMatrix(C,isrow,NULL,MAT_REUSE_MATRIX,&A)); 66 PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_COMMON)); 67 PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 68 PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD)); 69 70 /* Test MatDuplicate */ 71 PetscCall(MatDuplicate(A,MAT_COPY_VALUES,&Adup)); 72 PetscCall(MatDestroy(&Adup)); 73 74 PetscCall(ISDestroy(&isrow)); 75 PetscCall(MatDestroy(&A)); 76 PetscCall(MatDestroy(&C)); 77 PetscCall(PetscFinalize()); 78 return 0; 79 } 80 81 /*TEST 82 83 test: 84 nsize: 2 85 filter: grep -v "Mat Object" 86 requires: !complex 87 88 test: 89 suffix: 2 90 nsize: 3 91 args: -detect_bug 92 filter: grep -v "Mat Object" 93 requires: !complex 94 95 TEST*/ 96