1 2 static char help[] = "Tests MatReorderForNonzeroDiagonal().\n\n"; 3 4 #include <petscmat.h> 5 6 int main(int argc,char **argv) 7 { 8 Mat mat,B,C; 9 PetscErrorCode ierr; 10 PetscInt i,j; 11 PetscMPIInt size; 12 PetscScalar v; 13 IS isrow,iscol,identity; 14 PetscViewer viewer; 15 16 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 17 18 19 /* ------- Assemble matrix, --------- */ 20 21 ierr = MatCreate(PETSC_COMM_WORLD,&mat);CHKERRQ(ierr); 22 ierr = MatSetSizes(mat,PETSC_DECIDE,PETSC_DECIDE,4,4);CHKERRQ(ierr); 23 ierr = MatSetFromOptions(mat);CHKERRQ(ierr); 24 ierr = MatSetUp(mat);CHKERRQ(ierr); 25 26 /* set anti-diagonal of matrix */ 27 v = 1.0; 28 i = 0; j = 3; 29 ierr = MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 30 v = 2.0; 31 i = 1; j = 2; 32 ierr = MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 33 v = 3.0; 34 i = 2; j = 1; 35 ierr = MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 36 v = 4.0; 37 i = 3; j = 0; 38 ierr = MatSetValues(mat,1,&i,1,&j,&v,INSERT_VALUES);CHKERRQ(ierr); 39 ierr = MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 40 ierr = MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 41 42 ierr = PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer);CHKERRQ(ierr); 43 ierr = PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_DENSE);CHKERRQ(ierr); 44 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix\n");CHKERRQ(ierr); 45 ierr = MatView(mat,viewer);CHKERRQ(ierr); 46 47 ierr = MatGetOrdering(mat,MATORDERINGNATURAL,&isrow,&iscol);CHKERRQ(ierr); 48 49 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 50 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by identity\n");CHKERRQ(ierr); 51 ierr = MatView(B,viewer);CHKERRQ(ierr); 52 ierr = MatDestroy(&B);CHKERRQ(ierr); 53 54 ierr = MatReorderForNonzeroDiagonal(mat,1.e-8,isrow,iscol);CHKERRQ(ierr); 55 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 56 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by identity + NonzeroDiagonal()\n");CHKERRQ(ierr); 57 ierr = MatView(B,viewer);CHKERRQ(ierr); 58 ierr = PetscViewerASCIIPrintf(viewer,"Row permutation\n");CHKERRQ(ierr); 59 ierr = ISView(isrow,viewer);CHKERRQ(ierr); 60 ierr = PetscViewerASCIIPrintf(viewer,"Column permutation\n");CHKERRQ(ierr); 61 ierr = ISView(iscol,viewer);CHKERRQ(ierr); 62 ierr = MatDestroy(&B);CHKERRQ(ierr); 63 64 ierr = ISDestroy(&isrow);CHKERRQ(ierr); 65 ierr = ISDestroy(&iscol);CHKERRQ(ierr); 66 67 ierr = MatGetOrdering(mat,MATORDERINGND,&isrow,&iscol);CHKERRQ(ierr); 68 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 69 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by ND\n");CHKERRQ(ierr); 70 ierr = MatView(B,viewer);CHKERRQ(ierr); 71 ierr = MatDestroy(&B);CHKERRQ(ierr); 72 ierr = PetscViewerASCIIPrintf(viewer,"ND row permutation\n");CHKERRQ(ierr); 73 ierr = ISView(isrow,viewer);CHKERRQ(ierr); 74 ierr = PetscViewerASCIIPrintf(viewer,"ND column permutation\n");CHKERRQ(ierr); 75 ierr = ISView(iscol,viewer);CHKERRQ(ierr); 76 77 ierr = MatReorderForNonzeroDiagonal(mat,1.e-8,isrow,iscol);CHKERRQ(ierr); 78 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 79 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by ND + NonzeroDiagonal()\n");CHKERRQ(ierr); 80 ierr = MatView(B,viewer);CHKERRQ(ierr); 81 ierr = MatDestroy(&B);CHKERRQ(ierr); 82 ierr = PetscViewerASCIIPrintf(viewer,"ND + NonzeroDiagonal() row permutation\n");CHKERRQ(ierr); 83 ierr = ISView(isrow,viewer);CHKERRQ(ierr); 84 ierr = PetscViewerASCIIPrintf(viewer,"ND + NonzeroDiagonal() column permutation\n");CHKERRQ(ierr); 85 ierr = ISView(iscol,viewer);CHKERRQ(ierr); 86 87 ierr = ISDestroy(&isrow);CHKERRQ(ierr); 88 ierr = ISDestroy(&iscol);CHKERRQ(ierr); 89 90 ierr = MatGetOrdering(mat,MATORDERINGRCM,&isrow,&iscol);CHKERRQ(ierr); 91 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 92 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by RCM\n");CHKERRQ(ierr); 93 ierr = MatView(B,viewer);CHKERRQ(ierr); 94 ierr = MatDestroy(&B);CHKERRQ(ierr); 95 ierr = PetscViewerASCIIPrintf(viewer,"RCM row permutation\n");CHKERRQ(ierr); 96 ierr = ISView(isrow,viewer);CHKERRQ(ierr); 97 ierr = PetscViewerASCIIPrintf(viewer,"RCM column permutation\n");CHKERRQ(ierr); 98 ierr = ISView(iscol,viewer);CHKERRQ(ierr); 99 100 ierr = MatReorderForNonzeroDiagonal(mat,1.e-8,isrow,iscol);CHKERRQ(ierr); 101 ierr = MatPermute(mat,isrow,iscol,&B);CHKERRQ(ierr); 102 ierr = PetscViewerASCIIPrintf(viewer,"Original matrix permuted by RCM + NonzeroDiagonal()\n");CHKERRQ(ierr); 103 ierr = MatView(B,viewer);CHKERRQ(ierr); 104 ierr = PetscViewerASCIIPrintf(viewer,"RCM + NonzeroDiagonal() row permutation\n");CHKERRQ(ierr); 105 ierr = ISView(isrow,viewer);CHKERRQ(ierr); 106 ierr = PetscViewerASCIIPrintf(viewer,"RCM + NonzeroDiagonal() column permutation\n");CHKERRQ(ierr); 107 ierr = ISView(iscol,viewer);CHKERRQ(ierr); 108 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size); 109 if (size == 1) { 110 ierr = MatSetOption(B,MAT_SYMMETRIC,PETSC_TRUE);CHKERRQ(ierr); 111 ierr = ISCreateStride(PETSC_COMM_SELF,4,0,1,&identity);CHKERRQ(ierr); 112 ierr = MatPermute(B,identity,identity,&C);CHKERRQ(ierr); 113 ierr = MatConvert(C,MATSEQSBAIJ,MAT_INPLACE_MATRIX,&C);CHKERRQ(ierr); 114 ierr = MatDestroy(&C);CHKERRQ(ierr); 115 ierr = ISDestroy(&identity);CHKERRQ(ierr); 116 } 117 ierr = MatDestroy(&B);CHKERRQ(ierr); 118 /* Test MatLUFactor(); set diagonal as zeros as requested by PETSc matrix factorization */ 119 for (i=0; i<4; i++) { 120 v = 0.0; 121 ierr = MatSetValues(mat,1,&i,1,&i,&v,INSERT_VALUES);CHKERRQ(ierr); 122 } 123 ierr = MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 124 ierr = MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 125 ierr = MatLUFactor(mat,isrow,iscol,NULL);CHKERRQ(ierr); 126 127 /* Free data structures */ 128 ierr = ISDestroy(&isrow);CHKERRQ(ierr); 129 ierr = ISDestroy(&iscol);CHKERRQ(ierr); 130 ierr = MatDestroy(&mat);CHKERRQ(ierr); 131 132 ierr = PetscFinalize(); 133 return ierr; 134 } 135 136 137 138 /*TEST 139 140 test: 141 142 TEST*/ 143