1 2 static char help[] = "Tests Cholesky factorization for a SBAIJ matrix, (bs=2).\n"; 3 /* 4 This code is modified from the code contributed by JUNWANG@uwm.edu on Apr 13, 2007 5 */ 6 7 #include <petscmat.h> 8 9 int main(int argc,char **args) 10 { 11 Mat mat,fact,B; 12 PetscInt ind1[2],ind2[2]; 13 PetscScalar temp[4]; 14 PetscInt nnz[3]; 15 IS perm,colp; 16 MatFactorInfo info; 17 PetscMPIInt size; 18 19 CHKERRQ(PetscInitialize(&argc,&args,0,help)); 20 CHKERRMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 21 PetscCheckFalse(size != 1,PETSC_COMM_WORLD,PETSC_ERR_SUP,"This is a uniprocessor example only!"); 22 23 nnz[0]=2;nnz[1]=1;nnz[2]=1; 24 CHKERRQ(MatCreateSeqSBAIJ(PETSC_COMM_SELF,2,6,6,0,nnz,&mat)); 25 26 ind1[0]=0;ind1[1]=1; 27 temp[0]=3;temp[1]=2;temp[2]=0;temp[3]=3; 28 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 29 ind2[0]=4;ind2[1]=5; 30 temp[0]=1;temp[1]=1;temp[2]=2;temp[3]=1; 31 CHKERRQ(MatSetValues(mat,2,ind1,2,ind2,temp,INSERT_VALUES)); 32 ind1[0]=2;ind1[1]=3; 33 temp[0]=4;temp[1]=1;temp[2]=1;temp[3]=5; 34 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 35 ind1[0]=4;ind1[1]=5; 36 temp[0]=5;temp[1]=1;temp[2]=1;temp[3]=6; 37 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 38 39 CHKERRQ(MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY)); 40 CHKERRQ(MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY)); 41 42 CHKERRQ(MatDuplicate(mat,MAT_SHARE_NONZERO_PATTERN,&B)); 43 ind1[0]=0;ind1[1]=1; 44 temp[0]=3;temp[1]=2;temp[2]=0;temp[3]=3; 45 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 46 ind2[0]=4;ind2[1]=5; 47 temp[0]=1;temp[1]=1;temp[2]=2;temp[3]=1; 48 CHKERRQ(MatSetValues(mat,2,ind1,2,ind2,temp,INSERT_VALUES)); 49 ind1[0]=2;ind1[1]=3; 50 temp[0]=4;temp[1]=1;temp[2]=1;temp[3]=5; 51 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 52 ind1[0]=4;ind1[1]=5; 53 temp[0]=5;temp[1]=1;temp[2]=1;temp[3]=6; 54 CHKERRQ(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 55 56 CHKERRQ(MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY)); 57 CHKERRQ(MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY)); 58 59 CHKERRQ(PetscPrintf(PETSC_COMM_WORLD,"mat: \n")); 60 CHKERRQ(MatView(mat,PETSC_VIEWER_STDOUT_SELF)); 61 62 /* begin cholesky factorization */ 63 CHKERRQ(MatGetOrdering(mat,MATORDERINGNATURAL,&perm,&colp)); 64 CHKERRQ(ISDestroy(&colp)); 65 66 info.fill=1.0; 67 CHKERRQ(MatGetFactor(mat,MATSOLVERPETSC,MAT_FACTOR_CHOLESKY,&fact)); 68 CHKERRQ(MatCholeskyFactorSymbolic(fact,mat,perm,&info)); 69 CHKERRQ(MatCholeskyFactorNumeric(fact,mat,&info)); 70 71 CHKERRQ(ISDestroy(&perm)); 72 CHKERRQ(MatDestroy(&mat)); 73 CHKERRQ(MatDestroy(&fact)); 74 CHKERRQ(MatDestroy(&B)); 75 CHKERRQ(PetscFinalize()); 76 return 0; 77 } 78