2: #include <../src/mat/impls/baij/seq/baij.h>

  6: PETSC_EXTERN PetscErrorCode MatConvert_SeqBAIJ_SeqAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
  7: {
  8:   Mat            B;
  9:   Mat_SeqBAIJ    *a = (Mat_SeqBAIJ*)A->data;
 11:   PetscInt       bs = A->rmap->bs,*ai = a->i,*aj = a->j,n = A->rmap->N/bs,i,j,k;
 12:   PetscInt       *rowlengths,*rows,*cols,maxlen = 0,ncols;
 13:   MatScalar      *aa = a->a;

 16:   PetscMalloc1(n*bs,&rowlengths);
 17:   for (i=0; i<n; i++) {
 18:     maxlen = PetscMax(maxlen,(ai[i+1] - ai[i]));
 19:     for (j=0; j<bs; j++) {
 20:       rowlengths[i*bs+j] = bs*(ai[i+1] - ai[i]);
 21:     }
 22:   }
 23:   MatCreate(PetscObjectComm((PetscObject)A),&B);
 24:   MatSetSizes(B,A->rmap->n,A->cmap->n,A->rmap->N,A->cmap->N);
 25:   MatSetType(B,MATSEQAIJ);
 26:   MatSeqAIJSetPreallocation(B,0,rowlengths);
 27:   MatSetOption(B,MAT_ROW_ORIENTED,PETSC_FALSE);
 28:   PetscFree(rowlengths);

 30:   PetscMalloc1(bs,&rows);
 31:   PetscMalloc1(bs*maxlen,&cols);
 32:   for (i=0; i<n; i++) {
 33:     for (j=0; j<bs; j++) {
 34:       rows[j] = i*bs+j;
 35:     }
 36:     ncols = ai[i+1] - ai[i];
 37:     for (k=0; k<ncols; k++) {
 38:       for (j=0; j<bs; j++) {
 39:         cols[k*bs+j] = bs*(*aj) + j;
 40:       }
 41:       aj++;
 42:     }
 43:     MatSetValues(B,bs,rows,bs*ncols,cols,aa,INSERT_VALUES);
 44:     aa  += ncols*bs*bs;
 45:   }
 46:   PetscFree(cols);
 47:   PetscFree(rows);
 48:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
 49:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);

 51:   B->rmap->bs = A->rmap->bs;

 53:   if (reuse == MAT_REUSE_MATRIX) {
 54:     MatHeaderReplace(A,B);
 55:   } else {
 56:     *newmat = B;
 57:   }
 58:   return(0);
 59: }

 61: #include <../src/mat/impls/aij/seq/aij.h>

 65: PETSC_EXTERN PetscErrorCode MatConvert_SeqAIJ_SeqBAIJ(Mat A,MatType newtype,MatReuse reuse,Mat *newmat)
 66: {
 67:   Mat            B;
 68:   Mat_SeqAIJ     *a = (Mat_SeqAIJ*)A->data;
 69:   Mat_SeqBAIJ    *b;
 71:   PetscInt       *ai=a->i,m=A->rmap->N,n=A->cmap->N,i,*rowlengths;

 74:   if (n != m) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"Matrix must be square");
 75:   if (A->rmap->bs > 1) {
 76:     MatConvert_Basic(A,newtype,reuse,newmat);
 77:     return(0);
 78:   }

 80:   PetscMalloc1(m,&rowlengths);
 81:   for (i=0; i<m; i++) {
 82:     rowlengths[i] = ai[i+1] - ai[i];
 83:   }
 84:   MatCreate(PetscObjectComm((PetscObject)A),&B);
 85:   MatSetSizes(B,m,n,m,n);
 86:   MatSetType(B,MATSEQBAIJ);
 87:   MatSeqBAIJSetPreallocation_SeqBAIJ(B,1,0,rowlengths);
 88:   PetscFree(rowlengths);

 90:   MatSetOption(B,MAT_ROW_ORIENTED,PETSC_TRUE);

 92:   b = (Mat_SeqBAIJ*)(B->data);

 94:   PetscMemcpy(b->i,a->i,(m+1)*sizeof(PetscInt));
 95:   PetscMemcpy(b->ilen,a->ilen,m*sizeof(PetscInt));
 96:   PetscMemcpy(b->j,a->j,a->nz*sizeof(PetscInt));
 97:   PetscMemcpy(b->a,a->a,a->nz*sizeof(MatScalar));

 99:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
100:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);

102:   if (reuse == MAT_REUSE_MATRIX) {
103:     MatHeaderReplace(A,B);
104:   } else {
105:     *newmat = B;
106:   }
107:   return(0);
108: }