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 PetscFunctionBeginUser; 20 PetscCall(PetscInitialize(&argc,&args,0,help)); 21 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 22 PetscCheck(size == 1,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"This is a uniprocessor example only!"); 23 24 nnz[0]=2;nnz[1]=1;nnz[2]=1; 25 PetscCall(MatCreateSeqSBAIJ(PETSC_COMM_SELF,2,6,6,0,nnz,&mat)); 26 27 ind1[0]=0;ind1[1]=1; 28 temp[0]=3;temp[1]=2;temp[2]=0;temp[3]=3; 29 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 30 ind2[0]=4;ind2[1]=5; 31 temp[0]=1;temp[1]=1;temp[2]=2;temp[3]=1; 32 PetscCall(MatSetValues(mat,2,ind1,2,ind2,temp,INSERT_VALUES)); 33 ind1[0]=2;ind1[1]=3; 34 temp[0]=4;temp[1]=1;temp[2]=1;temp[3]=5; 35 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 36 ind1[0]=4;ind1[1]=5; 37 temp[0]=5;temp[1]=1;temp[2]=1;temp[3]=6; 38 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 39 40 PetscCall(MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY)); 41 PetscCall(MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY)); 42 43 PetscCall(MatDuplicate(mat,MAT_SHARE_NONZERO_PATTERN,&B)); 44 ind1[0]=0;ind1[1]=1; 45 temp[0]=3;temp[1]=2;temp[2]=0;temp[3]=3; 46 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 47 ind2[0]=4;ind2[1]=5; 48 temp[0]=1;temp[1]=1;temp[2]=2;temp[3]=1; 49 PetscCall(MatSetValues(mat,2,ind1,2,ind2,temp,INSERT_VALUES)); 50 ind1[0]=2;ind1[1]=3; 51 temp[0]=4;temp[1]=1;temp[2]=1;temp[3]=5; 52 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 53 ind1[0]=4;ind1[1]=5; 54 temp[0]=5;temp[1]=1;temp[2]=1;temp[3]=6; 55 PetscCall(MatSetValues(mat,2,ind1,2,ind1,temp,INSERT_VALUES)); 56 57 PetscCall(MatAssemblyBegin(mat,MAT_FINAL_ASSEMBLY)); 58 PetscCall(MatAssemblyEnd(mat,MAT_FINAL_ASSEMBLY)); 59 60 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"mat: \n")); 61 PetscCall(MatView(mat,PETSC_VIEWER_STDOUT_SELF)); 62 63 /* begin cholesky factorization */ 64 PetscCall(MatGetOrdering(mat,MATORDERINGNATURAL,&perm,&colp)); 65 PetscCall(ISDestroy(&colp)); 66 67 info.fill=1.0; 68 PetscCall(MatGetFactor(mat,MATSOLVERPETSC,MAT_FACTOR_CHOLESKY,&fact)); 69 PetscCall(MatCholeskyFactorSymbolic(fact,mat,perm,&info)); 70 PetscCall(MatCholeskyFactorNumeric(fact,mat,&info)); 71 72 PetscCall(ISDestroy(&perm)); 73 PetscCall(MatDestroy(&mat)); 74 PetscCall(MatDestroy(&fact)); 75 PetscCall(MatDestroy(&B)); 76 PetscCall(PetscFinalize()); 77 return 0; 78 } 79