Actual source code: aijbaij.c
petsc-3.13.6 2020-09-29
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      2:  #include <../src/mat/impls/baij/seq/baij.h>

      4: PETSC_INTERN PetscErrorCode MatConvert_SeqBAIJ_SeqAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
      5: {
      6:   Mat            B;
      7:   Mat_SeqAIJ     *b;
      8:   PetscBool      roworiented;
      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:   if (reuse == MAT_REUSE_MATRIX) {
     17:     B = *newmat;
     18:     for (i=0; i<n; i++) {
     19:       maxlen = PetscMax(maxlen,(ai[i+1] - ai[i]));
     20:     }
     21:   } else {
     22:     PetscMalloc1(n*bs,&rowlengths);
     23:     for (i=0; i<n; i++) {
     24:       maxlen = PetscMax(maxlen,(ai[i+1] - ai[i]));
     25:       for (j=0; j<bs; j++) {
     26:         rowlengths[i*bs+j] = bs*(ai[i+1] - ai[i]);
     27:       }
     28:     }
     29:     MatCreate(PetscObjectComm((PetscObject)A),&B);
     30:     MatSetType(B,MATSEQAIJ);
     31:     MatSetSizes(B,A->rmap->n,A->cmap->n,A->rmap->N,A->cmap->N);
     32:     MatSetBlockSizes(B,A->rmap->bs,A->cmap->bs);
     33:     MatSeqAIJSetPreallocation(B,0,rowlengths);
     34:     PetscFree(rowlengths);
     35:   }
     36:   b = (Mat_SeqAIJ*)B->data;
     37:   roworiented = b->roworiented;

     39:   MatSetOption(B,MAT_ROW_ORIENTED,PETSC_FALSE);
     40:   PetscMalloc1(bs,&rows);
     41:   PetscMalloc1(bs*maxlen,&cols);
     42:   for (i=0; i<n; i++) {
     43:     for (j=0; j<bs; j++) {
     44:       rows[j] = i*bs+j;
     45:     }
     46:     ncols = ai[i+1] - ai[i];
     47:     for (k=0; k<ncols; k++) {
     48:       for (j=0; j<bs; j++) {
     49:         cols[k*bs+j] = bs*(*aj) + j;
     50:       }
     51:       aj++;
     52:     }
     53:     MatSetValues(B,bs,rows,bs*ncols,cols,aa,INSERT_VALUES);
     54:     aa  += ncols*bs*bs;
     55:   }
     56:   PetscFree(cols);
     57:   PetscFree(rows);
     58:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
     59:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);
     60:   MatSetOption(B,MAT_ROW_ORIENTED,roworiented);

     62:   if (reuse == MAT_INPLACE_MATRIX) {
     63:     MatHeaderReplace(A,&B);
     64:   } else *newmat = B;
     65:   return(0);
     66: }

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

     70: PETSC_INTERN PetscErrorCode MatConvert_SeqAIJ_SeqBAIJ(Mat A,MatType newtype,MatReuse reuse,Mat *newmat)
     71: {
     72:   Mat            B;
     73:   Mat_SeqAIJ     *a = (Mat_SeqAIJ*)A->data;
     74:   Mat_SeqBAIJ    *b;
     76:   PetscInt       *ai=a->i,m=A->rmap->N,n=A->cmap->N,i,*rowlengths,bs=PetscAbs(A->rmap->bs);

     79:   if (reuse != MAT_REUSE_MATRIX) {
     80:     PetscMalloc1(m/bs,&rowlengths);
     81:     for (i=0; i<m/bs; i++) {
     82:       rowlengths[i] = (ai[i*bs+1] - ai[i*bs])/bs;
     83:     }
     84:     MatCreate(PetscObjectComm((PetscObject)A),&B);
     85:     MatSetSizes(B,m,n,m,n);
     86:     MatSetType(B,MATSEQBAIJ);
     87:     MatSeqBAIJSetPreallocation(B,bs,0,rowlengths);
     88:     PetscFree(rowlengths);
     89:   } else B = *newmat;

     91:   if (bs == 1) {
     92:     b = (Mat_SeqBAIJ*)(B->data);

     94:     PetscArraycpy(b->i,a->i,m+1);
     95:     PetscArraycpy(b->ilen,a->ilen,m);
     96:     PetscArraycpy(b->j,a->j,a->nz);
     97:     PetscArraycpy(b->a,a->a,a->nz);

     99:     MatSetOption(B,MAT_ROW_ORIENTED,PETSC_TRUE);
    100:     MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
    101:     MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);
    102:   } else {
    103:     /* reuse may not be equal to MAT_REUSE_MATRIX, but the basic converter will reallocate or replace newmat if this value is not used */
    104:     /* if reuse is equal to MAT_INITIAL_MATRIX, it has been appropriately preallocated before                                          */
    105:     /*                      MAT_INPLACE_MATRIX, it will be replaced with MatHeaderReplace below                                        */
    106:     MatConvert_Basic(A,newtype,MAT_REUSE_MATRIX,&B);
    107:   }

    109:   if (reuse == MAT_INPLACE_MATRIX) {
    110:     MatHeaderReplace(A,&B);
    111:   } else *newmat = B;
    112:   return(0);
    113: }