2:  #include <../src/mat/impls/sbaij/mpi/mpisbaij.h>
  3:  #include <../src/mat/impls/aij/mpi/mpiaij.h>
  4:  #include <petsc/private/matimpl.h>
  5:  #include <petscmat.h>

  7: PETSC_INTERN PetscErrorCode MatConvert_MPIAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
  8: {
  9:   PetscErrorCode    ierr;
 10:   Mat               M;
 11:   Mat_MPIAIJ        *mpimat = (Mat_MPIAIJ*)A->data;
 12:   Mat_SeqAIJ        *Aa     = (Mat_SeqAIJ*)mpimat->A->data,*Ba = (Mat_SeqAIJ*)mpimat->B->data;
 13:   PetscInt          *d_nnz,*o_nnz;
 14:   PetscInt          i,j,nz;
 15:   PetscInt          m,n,lm,ln;
 16:   PetscInt          rstart,rend;
 17:   const PetscScalar *vwork;
 18:   const PetscInt    *cwork;

 21:   if (!A->symmetric) SETERRQ(PetscObjectComm((PetscObject)A),PETSC_ERR_USER,"Matrix must be symmetric. Call MatSetOption(mat,MAT_SYMMETRIC,PETSC_TRUE)");
 22:   MatGetSize(A,&m,&n);
 23:   MatGetLocalSize(A,&lm,&ln);
 24:   PetscMalloc2(lm,&d_nnz,lm,&o_nnz);

 26:   MatMarkDiagonal_SeqAIJ(mpimat->A);
 27:   for (i=0; i<lm; i++) {
 28:     d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
 29:     o_nnz[i] = Ba->i[i+1] - Ba->i[i];
 30:   }

 32:   MatCreate(PetscObjectComm((PetscObject)A),&M);
 33:   MatSetSizes(M,lm,ln,m,n);
 34:   MatSetType(M,MATMPISBAIJ);
 35:   MatSeqSBAIJSetPreallocation(M,1,0,d_nnz);
 36:   MatMPISBAIJSetPreallocation(M,1,0,d_nnz,0,o_nnz);

 38:   PetscFree2(d_nnz,o_nnz);

 40:   MatGetOwnershipRange(A,&rstart,&rend);
 41:   for (i=rstart; i<rend; i++) {
 42:     MatGetRow(A,i,&nz,&cwork,&vwork);
 43:     j    = 0;
 44:     while (cwork[j] < i) {
 45:       j++; nz--;
 46:     }
 47:     MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);
 48:     MatRestoreRow(A,i,&nz,&cwork,&vwork);
 49:   }
 50:   MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
 51:   MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);

 53:   if (reuse == MAT_INPLACE_MATRIX) {
 54:     MatHeaderReplace(A,&M);
 55:   } else {
 56:     *newmat = M;
 57:   }
 58:   return(0);
 59: }
 60: /* contributed by Dahai Guo <dhguo@ncsa.uiuc.edu> April 2011 */
 61: PETSC_INTERN PetscErrorCode MatConvert_MPIBAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
 62: {
 63:   PetscErrorCode    ierr;
 64:   Mat               M;
 65:   Mat_MPIBAIJ       *mpimat = (Mat_MPIBAIJ*)A->data;
 66:   Mat_SeqBAIJ       *Aa     = (Mat_SeqBAIJ*)mpimat->A->data,*Ba = (Mat_SeqBAIJ*)mpimat->B->data;
 67:   PetscInt          *d_nnz,*o_nnz;
 68:   PetscInt          i,j,nz;
 69:   PetscInt          m,n,lm,ln;
 70:   PetscInt          rstart,rend;
 71:   const PetscScalar *vwork;
 72:   const PetscInt    *cwork;
 73:   PetscInt          bs = A->rmap->bs;

 76:   MatGetSize(A,&m,&n);
 77:   MatGetLocalSize(A,&lm,&ln);
 78:   PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz);

 80:   MatMarkDiagonal_SeqBAIJ(mpimat->A);
 81:   for (i=0; i<lm/bs; i++) {
 82:     d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
 83:     o_nnz[i] = Ba->i[i+1] - Ba->i[i];
 84:   }

 86:   MatCreate(PetscObjectComm((PetscObject)A),&M);
 87:   MatSetSizes(M,lm,ln,m,n);
 88:   MatSetType(M,MATMPISBAIJ);
 89:   MatSeqSBAIJSetPreallocation(M,bs,0,d_nnz);
 90:   MatMPISBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz);

 92:   PetscFree2(d_nnz,o_nnz);

 94:   MatGetOwnershipRange(A,&rstart,&rend);
 95:   MatSetOption(M,MAT_IGNORE_LOWER_TRIANGULAR,PETSC_TRUE);
 96:   for (i=rstart; i<rend; i++) {
 97:     MatGetRow(A,i,&nz,&cwork,&vwork);
 98:     j    = 0;
 99:     MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);
100:     MatRestoreRow(A,i,&nz,&cwork,&vwork);
101:   }
102:   MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
103:   MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);

105:   if (reuse == MAT_INPLACE_MATRIX) {
106:     MatHeaderReplace(A,&M);
107:   } else {
108:     *newmat = M;
109:   }
110:   return(0);
111: }