Actual source code: aijsbaij.c
1: /*$Id: aijsbaij.c,v 1.9 2001/08/07 03:02:55 balay Exp $*/
3: #include src/mat/impls/aij/seq/aij.h
4: #include src/mat/impls/sbaij/seq/sbaij.h
6: EXTERN_C_BEGIN
7: #undef __FUNCT__
9: int MatConvert_SeqAIJ_SeqSBAIJ(Mat A,MatType newtype,Mat *B)
10: {
11: Mat_SeqAIJ *a = (Mat_SeqAIJ*)A->data;
12: Mat_SeqSBAIJ *b;
13: int ierr,*ai=a->i,*aj,m=A->M,n=A->N,i,j,
14: *bi,*bj,*rowlengths;
15: PetscScalar *av,*bv;
18: if (n != m) SETERRQ(PETSC_ERR_ARG_WRONG,"Matrix must be square");
19: if (!a->diag){
20: MatMarkDiagonal_SeqAIJ(A);
21: }
23: PetscMalloc(m*sizeof(int),&rowlengths);
24: for (i=0; i<m; i++) {
25: rowlengths[i] = ai[i+1] - a->diag[i];
26: }
27: MatCreateSeqSBAIJ(PETSC_COMM_SELF,1,m,n,0,rowlengths,B);
29: MatSetOption(*B,MAT_ROW_ORIENTED);
30: MatSetOption(*B,MAT_ROWS_SORTED);
31: MatSetOption(*B,MAT_COLUMNS_SORTED);
32:
33: b = (Mat_SeqSBAIJ*)(*B)->data;
34: bi = b->i;
35: bj = b->j;
36: bv = b->a;
38: bi[0] = 0;
39: for (i=0; i<m; i++) {
40: aj = a->j + a->diag[i];
41: av = a->a + a->diag[i];
42: for (j=0; j<rowlengths[i]; j++){
43: *bj = *aj; bj++; aj++;
44: *bv = *av; bv++; av++;
45: }
46: bi[i+1] = bi[i] + rowlengths[i];
47: b->ilen[i] = rowlengths[i];
48: }
49:
50: PetscFree(rowlengths);
51: MatAssemblyBegin(*B,MAT_FINAL_ASSEMBLY);
52: MatAssemblyEnd(*B,MAT_FINAL_ASSEMBLY);
53: return(0);
54: }
55: EXTERN_C_END