1 2 static char help[] = "Tests matrix ordering routines.\n\n"; 3 4 #include <petscmat.h> 5 extern PetscErrorCode MatGetOrdering_myordering(Mat,MatOrderingType,IS*,IS*); 6 7 int main(int argc,char **args) 8 { 9 Mat C,Cperm; 10 PetscInt i,j,m = 5,n = 5,Ii,J,ncols; 11 PetscScalar v; 12 PetscMPIInt size; 13 IS rperm,cperm,icperm; 14 const PetscInt *rperm_ptr,*cperm_ptr,*cols; 15 const PetscScalar *vals; 16 PetscBool TestMyorder=PETSC_FALSE; 17 18 CHKERRQ(PetscInitialize(&argc,&args,(char*)0,help)); 19 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 20 PetscCheckFalse(size != 1,PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 21 22 /* create the matrix for the five point stencil, YET AGAIN */ 23 CHKERRQ(MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,NULL,&C)); 24 CHKERRQ(MatSetUp(C)); 25 for (i=0; i<m; i++) { 26 for (j=0; j<n; j++) { 27 v = -1.0; Ii = j + n*i; 28 if (i>0) {J = Ii - n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 29 if (i<m-1) {J = Ii + n; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 30 if (j>0) {J = Ii - 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 31 if (j<n-1) {J = Ii + 1; CHKERRQ(MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES));} 32 v = 4.0; CHKERRQ(MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES)); 33 } 34 } 35 CHKERRQ(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY)); 36 CHKERRQ(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY)); 37 38 CHKERRQ(MatGetOrdering(C,MATORDERINGND,&rperm,&cperm)); 39 CHKERRQ(ISView(rperm,PETSC_VIEWER_STDOUT_SELF)); 40 CHKERRQ(ISDestroy(&rperm)); 41 CHKERRQ(ISDestroy(&cperm)); 42 43 CHKERRQ(MatGetOrdering(C,MATORDERINGRCM,&rperm,&cperm)); 44 CHKERRQ(ISView(rperm,PETSC_VIEWER_STDOUT_SELF)); 45 CHKERRQ(ISDestroy(&rperm)); 46 CHKERRQ(ISDestroy(&cperm)); 47 48 CHKERRQ(MatGetOrdering(C,MATORDERINGQMD,&rperm,&cperm)); 49 CHKERRQ(ISView(rperm,PETSC_VIEWER_STDOUT_SELF)); 50 CHKERRQ(ISDestroy(&rperm)); 51 CHKERRQ(ISDestroy(&cperm)); 52 53 /* create Cperm = rperm*C*icperm */ 54 CHKERRQ(PetscOptionsGetBool(NULL,NULL,"-testmyordering",&TestMyorder,NULL)); 55 if (TestMyorder) { 56 CHKERRQ(MatGetOrdering_myordering(C,MATORDERINGQMD,&rperm,&cperm)); 57 printf("myordering's rperm:\n"); 58 CHKERRQ(ISView(rperm,PETSC_VIEWER_STDOUT_SELF)); 59 CHKERRQ(ISInvertPermutation(cperm,PETSC_DECIDE,&icperm)); 60 CHKERRQ(ISGetIndices(rperm,&rperm_ptr)); 61 CHKERRQ(ISGetIndices(icperm,&cperm_ptr)); 62 CHKERRQ(MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,NULL,&Cperm)); 63 for (i=0; i<m*n; i++) { 64 CHKERRQ(MatGetRow(C,rperm_ptr[i],&ncols,&cols,&vals)); 65 for (j=0; j<ncols; j++) { 66 /* printf(" (%d %d %g)\n",i,cperm_ptr[cols[j]],vals[j]); */ 67 CHKERRQ(MatSetValues(Cperm,1,&i,1,&cperm_ptr[cols[j]],&vals[j],INSERT_VALUES)); 68 } 69 } 70 CHKERRQ(MatAssemblyBegin(Cperm,MAT_FINAL_ASSEMBLY)); 71 CHKERRQ(MatAssemblyEnd(Cperm,MAT_FINAL_ASSEMBLY)); 72 CHKERRQ(ISRestoreIndices(rperm,&rperm_ptr)); 73 CHKERRQ(ISRestoreIndices(icperm,&cperm_ptr)); 74 75 CHKERRQ(ISDestroy(&rperm)); 76 CHKERRQ(ISDestroy(&cperm)); 77 CHKERRQ(ISDestroy(&icperm)); 78 CHKERRQ(MatDestroy(&Cperm)); 79 } 80 81 CHKERRQ(MatDestroy(&C)); 82 CHKERRQ(PetscFinalize()); 83 return 0; 84 } 85 86 #include <petsc/private/matimpl.h> 87 /* This is modified from MatGetOrdering_Natural() */ 88 PetscErrorCode MatGetOrdering_myordering(Mat mat,MatOrderingType type,IS *irow,IS *icol) 89 { 90 PetscInt n,i,*ii; 91 PetscBool done; 92 MPI_Comm comm; 93 94 PetscFunctionBegin; 95 CHKERRQ(PetscObjectGetComm((PetscObject)mat,&comm)); 96 CHKERRQ(MatGetRowIJ(mat,0,PETSC_FALSE,PETSC_TRUE,&n,NULL,NULL,&done)); 97 CHKERRQ(MatRestoreRowIJ(mat,0,PETSC_FALSE,PETSC_TRUE,NULL,NULL,NULL,&done)); 98 if (done) { /* matrix may be "compressed" in symbolic factorization, due to i-nodes or block storage */ 99 CHKERRQ(PetscMalloc1(n,&ii)); 100 for (i=0; i<n; i++) ii[i] = n-i-1; /* replace your index here */ 101 CHKERRQ(ISCreateGeneral(PETSC_COMM_SELF,n,ii,PETSC_COPY_VALUES,irow)); 102 CHKERRQ(ISCreateGeneral(PETSC_COMM_SELF,n,ii,PETSC_OWN_POINTER,icol)); 103 } else SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"MatRestoreRowIJ fails!"); 104 CHKERRQ(ISSetPermutation(*irow)); 105 CHKERRQ(ISSetPermutation(*icol)); 106 PetscFunctionReturn(0); 107 } 108 109 /*TEST 110 111 test: 112 113 TEST*/ 114