vec_permute()

template<typename CoeffRing>

void SMat< CoeffRing >::vec_permute ( sparsevec *& v, size_t start_row, M2_arrayint perm ) const

private

Definition at line 772 of file smat.hpp.

{
  size_t *perminv = newarray_atomic(size_t, perm->len);
  for (size_t i = 0; i < perm->len; i++) perminv[perm->array[i]] = i;
 
  size_t end_row = start_row + perm->len;
 
  for (sparsevec *w = v; w != 0; w = w->next)
    if (w->row >= start_row && w->row < end_row)
      w->row = start_row + perminv[w->row - start_row];
  vec_sort(v);
  freemem(perminv);
}

References freemem(), newarray_atomic, SMat< ACoeffRing >::sparsevec::next, and vec_sort().

Referenced by row_permute().