static PetscErrorCode MatWrapML_SeqAIJ(ML_Operator *mlmat,MatReuse reuse,Mat *newmat)
{
struct ML_CSR_MSRdata *matdata = (struct ML_CSR_MSRdata *)mlmat->data;
PetscErrorCode ierr;
PetscInt m=mlmat->outvec_leng,n=mlmat->invec_leng,*nnz = PETSC_NULL,nz_max;
PetscInt *ml_cols=matdata->columns,*ml_rowptr=matdata->rowptr,*aj,i,j,k;
PetscScalar *ml_vals=matdata->values,*aa;
PetscFunctionBegin;
if (!mlmat->getrow) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_NULL,"mlmat->getrow = NULL");
if (m != n){ /* ML Pmat and Rmat are in CSR format. Pass array pointers into SeqAIJ matrix */
if (reuse){
Mat_SeqAIJ *aij= (Mat_SeqAIJ*)(*newmat)->data;
aij->i = ml_rowptr;
aij->j = ml_cols;
aij->a = ml_vals;
} else {
/* sort ml_cols and ml_vals */
ierr = PetscMalloc((m+1)*sizeof(PetscInt),&nnz);
for (i=0; i<m; i++) {
nnz[i] = ml_rowptr[i+1] - ml_rowptr[i];
}
aj = ml_cols; aa = ml_vals;
for (i=0; i<m; i++){
ierr = PetscSortIntWithScalarArray(nnz[i],aj,aa);CHKERRQ(ierr);
aj += nnz[i]; aa += nnz[i];
}
ierr = MatCreateSeqAIJWithArrays(PETSC_COMM_SELF,m,n,ml_rowptr,ml_cols,ml_vals,newmat);CHKERRQ(ierr);
ierr = PetscFree(nnz);CHKERRQ(ierr);
}
PetscFunctionReturn(0);
}
/* ML Amat is in MSR format. Copy its data into SeqAIJ matrix */
if (reuse) {
for (nz_max=0,i=0; i<m; i++) nz_max = PetscMax(nz_max,ml_cols[i+1] - ml_cols[i] + 1);
} else {
ierr = MatCreate(PETSC_COMM_SELF,newmat);CHKERRQ(ierr);
ierr = MatSetSizes(*newmat,m,n,PETSC_DECIDE,PETSC_DECIDE);CHKERRQ(ierr);
ierr = MatSetType(*newmat,MATSEQAIJ);CHKERRQ(ierr);
ierr = PetscMalloc((m+1)*sizeof(PetscInt),&nnz);
nz_max = 1;
for (i=0; i<m; i++) {
nnz[i] = ml_cols[i+1] - ml_cols[i] + 1;
if (nnz[i] > nz_max) nz_max = nnz[i];
}
ierr = MatSeqAIJSetPreallocation(*newmat,0,nnz);CHKERRQ(ierr);
}
ierr = PetscMalloc2(nz_max,PetscScalar,&aa,nz_max,PetscInt,&aj);CHKERRQ(ierr);
for (i=0; i<m; i++) {
PetscInt ncols;
k = 0;
/* diagonal entry */
aj[k] = i; aa[k++] = ml_vals[i];
/* off diagonal entries */
for (j=ml_cols[i]; j<ml_cols[i+1]; j++){
aj[k] = ml_cols[j]; aa[k++] = ml_vals[j];
}
ncols = ml_cols[i+1] - ml_cols[i] + 1;
/* sort aj and aa */
ierr = PetscSortIntWithScalarArray(ncols,aj,aa);CHKERRQ(ierr);
ierr = MatSetValues(*newmat,1,&i,ncols,aj,aa,INSERT_VALUES);CHKERRQ(ierr);
}
ierr = MatAssemblyBegin(*newmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
ierr = MatAssemblyEnd(*newmat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr);
ierr = PetscFree2(aa,aj);CHKERRQ(ierr);
ierr = PetscFree(nnz);CHKERRQ(ierr);
PetscFunctionReturn(0);
}
void PETSC_STDCALL petscsortintwithscalararray_(PetscInt *n,PetscInt i[],PetscScalar Ii[], int *__ierr ){
*__ierr = PetscSortIntWithScalarArray(*n,i,Ii);
}