C++ (Cpp) MatMarkDiagonal_SeqAIJ Beispiele

Beispiel #1

Datei: mpiaijsbaij.c Projekt: erdc-cm/petsc-dev

EXTERN_C_BEGIN
#undef __FUNCT__
#define __FUNCT__ "MatConvert_MPIAIJ_MPISBAIJ"
PetscErrorCode  MatConvert_MPIAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
{
  PetscErrorCode     ierr;
  Mat                M;
  Mat_MPIAIJ         *mpimat = (Mat_MPIAIJ*)A->data;
  Mat_SeqAIJ         *Aa = (Mat_SeqAIJ*)mpimat->A->data,*Ba = (Mat_SeqAIJ*)mpimat->B->data;
  PetscInt           *d_nnz,*o_nnz;
  PetscInt           i,j,nz;
  PetscInt           m,n,lm,ln;
  PetscInt           rstart,rend;
  const PetscScalar  *vwork;
  const PetscInt     *cwork;

  PetscFunctionBegin;
  if (!A->symmetric) SETERRQ(((PetscObject)A)->comm,PETSC_ERR_USER,"Matrix must be symmetric. Call MatSetOption(mat,MAT_SYMMETRIC,PETSC_TRUE)");
  ierr = MatGetSize(A,&m,&n);CHKERRQ(ierr);
  ierr = MatGetLocalSize(A,&lm,&ln);CHKERRQ(ierr);
  ierr = PetscMalloc2(lm,PetscInt,&d_nnz,lm,PetscInt,&o_nnz);CHKERRQ(ierr);

  ierr = MatMarkDiagonal_SeqAIJ(mpimat->A);CHKERRQ(ierr);
  for (i=0;i<lm;i++){
    d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
    o_nnz[i] = Ba->i[i+1] - Ba->i[i];
  }

  ierr = MatCreate(((PetscObject)A)->comm,&M);CHKERRQ(ierr);
  ierr = MatSetSizes(M,lm,ln,m,n);CHKERRQ(ierr);
  ierr = MatSetType(M,MATMPISBAIJ);CHKERRQ(ierr);
  ierr = MatSeqSBAIJSetPreallocation(M,1,0,d_nnz);CHKERRQ(ierr);
  ierr = MatMPISBAIJSetPreallocation(M,1,0,d_nnz,0,o_nnz);CHKERRQ(ierr);

  ierr = PetscFree2(d_nnz,o_nnz);CHKERRQ(ierr);

  ierr = MatGetOwnershipRange(A,&rstart,&rend);CHKERRQ(ierr);
  for (i=rstart;i<rend;i++){
    ierr = MatGetRow(A,i,&nz,&cwork,&vwork);CHKERRQ(ierr);
    j = 0;
    while (cwork[j] < i){ j++; nz--;}
    ierr = MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);CHKERRQ(ierr);
    ierr = MatRestoreRow(A,i,&nz,&cwork,&vwork);CHKERRQ(ierr);
  }
  ierr = MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
  ierr = MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);

  if (reuse == MAT_REUSE_MATRIX) {
    ierr = MatHeaderReplace(A,M);CHKERRQ(ierr);
  } else {
    *newmat = M;
  }
  PetscFunctionReturn(0);
}

Beispiel #2

Datei: aijcholmod.c Projekt: 00liujj/petsc

static PetscErrorCode MatWrapCholmod_seqaij(Mat A,PetscBool values,cholmod_sparse *C,PetscBool  *aijalloc)
{
  Mat_SeqAIJ      *aij = (Mat_SeqAIJ*)A->data;
  const PetscInt  *ai  = aij->i,*aj = aij->j,*adiag;
  const MatScalar *aa  = aij->a;
  PetscInt        m    = A->rmap->n,i,j,k,nz,*ci,*cj;
  PetscScalar     *ca;
  PetscErrorCode  ierr;

  PetscFunctionBegin;
  ierr  = MatMarkDiagonal_SeqAIJ(A);CHKERRQ(ierr);
  adiag = aij->diag;
  for (i=0,nz=0; i<m; i++) nz += ai[i+1] - adiag[i];
  ierr = PetscMalloc3(m+1,&ci,nz,&cj,values ? nz : 0,&ca);CHKERRQ(ierr);
  for (i=0,k=0; i<m; i++) {
    ci[i] = k;
    for (j=adiag[i]; j<ai[i+1]; j++,k++) {
      cj[k] = aj[j];
      if (values) ca[k] = aa[j];
    }
  }
  ci[i]     = k;
  *aijalloc = PETSC_TRUE;

  ierr = PetscMemzero(C,sizeof(*C));CHKERRQ(ierr);

  C->nrow   = (size_t)A->cmap->n;
  C->ncol   = (size_t)A->rmap->n;
  C->nzmax  = (size_t)nz;
  C->p      = ci;
  C->i      = cj;
  C->x      = values ? ca : 0;
  C->stype  = -1;
  C->itype  = CHOLMOD_INT_TYPE;
  C->xtype  = values ? CHOLMOD_SCALAR_TYPE : CHOLMOD_PATTERN;
  C->dtype  = CHOLMOD_DOUBLE;
  C->sorted = 1;
  C->packed = 1;
  PetscFunctionReturn(0);
}