1 2 static char help[] = "Tests the use of MatZeroRows() for parallel matrices.\n\ 3 This example also tests the use of MatDuplicate() for both MPIAIJ and MPIBAIJ matrices"; 4 5 #include <petscmat.h> 6 7 extern PetscErrorCode TestMatZeroRows_Basic(Mat,IS,PetscScalar); 8 extern PetscErrorCode TestMatZeroRows_with_no_allocation(Mat,IS,PetscScalar); 9 10 int main(int argc,char **args) 11 { 12 Mat A; 13 PetscInt i,j,m = 3,n,Ii,J,Imax; 14 PetscMPIInt rank,size; 15 PetscErrorCode ierr; 16 PetscScalar v,diag=-4.0; 17 IS is; 18 19 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 20 CHKERRMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 21 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 22 n = 2*size; 23 24 /* create A Square matrix for the five point stencil,YET AGAIN*/ 25 CHKERRQ(MatCreate(PETSC_COMM_WORLD,&A)); 26 CHKERRQ(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n)); 27 CHKERRQ(MatSetFromOptions(A)); 28 CHKERRQ(MatSetUp(A)); 29 for (i=0; i<m; i++) { 30 for (j=2*rank; j<2*rank+2; j++) { 31 v = -1.0; Ii = j + n*i; 32 if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 33 if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 34 if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 35 if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 36 v = 4.0; CHKERRQ(MatSetValues(A,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 37 } 38 } 39 CHKERRQ(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 40 CHKERRQ(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 41 42 /* Create AN IS required by MatZeroRows() */ 43 Imax = n*rank; if (Imax>= n*m -m - 1) Imax = m*n - m - 1; 44 CHKERRQ(ISCreateStride(PETSC_COMM_SELF,m,Imax,1,&is)); 45 46 CHKERRQ(TestMatZeroRows_Basic(A,is,0.0)); 47 CHKERRQ(TestMatZeroRows_Basic(A,is,diag)); 48 49 CHKERRQ(TestMatZeroRows_with_no_allocation(A,is,0.0)); 50 CHKERRQ(TestMatZeroRows_with_no_allocation(A,is,diag)); 51 52 CHKERRQ(MatDestroy(&A)); 53 54 /* Now Create a rectangular matrix with five point stencil (app) 55 n+size is used so that this dimension is always divisible by size. 56 This way, we can always use bs = size for any number of procs */ 57 CHKERRQ(MatCreate(PETSC_COMM_WORLD,&A)); 58 CHKERRQ(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m*n,m*(n+size))); 59 CHKERRQ(MatSetFromOptions(A)); 60 CHKERRQ(MatSetUp(A)); 61 for (i=0; i<m; i++) { 62 for (j=2*rank; j<2*rank+2; j++) { 63 v = -1.0; Ii = j + n*i; 64 if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 65 if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 66 if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 67 if (j<n+size-1) {J = Ii + 1; CHKERRQ(MatSetValues(A,1,&Ii,1,&J,&v,INSERT_VALUES));} 68 v = 4.0; CHKERRQ(MatSetValues(A,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 69 } 70 } 71 CHKERRQ(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); 72 CHKERRQ(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY)); 73 74 CHKERRQ(TestMatZeroRows_Basic(A,is,0.0)); 75 CHKERRQ(TestMatZeroRows_Basic(A,is,diag)); 76 77 CHKERRQ(MatDestroy(&A)); 78 CHKERRQ(ISDestroy(&is)); 79 ierr = PetscFinalize(); 80 return ierr; 81 } 82 83 PetscErrorCode TestMatZeroRows_Basic(Mat A,IS is,PetscScalar diag) 84 { 85 Mat B; 86 PetscBool keepnonzeropattern; 87 88 /* Now copy A into B, and test it with MatZeroRows() */ 89 CHKERRQ(MatDuplicate(A,MAT_COPY_VALUES,&B)); 90 91 CHKERRQ(PetscOptionsHasName(NULL,NULL,"-keep_nonzero_pattern",&keepnonzeropattern)); 92 if (keepnonzeropattern) { 93 CHKERRQ(MatSetOption(B,MAT_KEEP_NONZERO_PATTERN,PETSC_TRUE)); 94 } 95 96 CHKERRQ(MatZeroRowsIS(B,is,diag,0,0)); 97 CHKERRQ(MatView(B,PETSC_VIEWER_STDOUT_WORLD)); 98 CHKERRQ(MatDestroy(&B)); 99 return 0; 100 } 101 102 PetscErrorCode TestMatZeroRows_with_no_allocation(Mat A,IS is,PetscScalar diag) 103 { 104 Mat B; 105 106 /* Now copy A into B, and test it with MatZeroRows() */ 107 CHKERRQ(MatDuplicate(A,MAT_COPY_VALUES,&B)); 108 /* Set this flag after assembly. This way, it affects only MatZeroRows() */ 109 CHKERRQ(MatSetOption(B,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_TRUE)); 110 111 CHKERRQ(MatZeroRowsIS(B,is,diag,0,0)); 112 CHKERRQ(MatView(B,PETSC_VIEWER_STDOUT_WORLD)); 113 CHKERRQ(MatDestroy(&B)); 114 return 0; 115 } 116 117 /*TEST 118 119 test: 120 nsize: 2 121 filter: grep -v "MPI processes" 122 123 test: 124 suffix: 2 125 nsize: 3 126 args: -mat_type mpibaij -mat_block_size 3 127 filter: grep -v "MPI processes" 128 129 test: 130 suffix: 3 131 nsize: 3 132 args: -mat_type mpiaij -keep_nonzero_pattern 133 filter: grep -v "MPI processes" 134 135 test: 136 suffix: 4 137 nsize: 3 138 args: -keep_nonzero_pattern -mat_type mpibaij -mat_block_size 3 139 filter: grep -v "MPI processes" 140 141 TEST*/ 142