computeHashValue()

unsigned int Matrix::computeHashValue ( ) const

protectedvirtual

Implements EngineObject.

Definition at line 43 of file matrix.cpp.

{
  unsigned int hashval = 234123 + (7 * n_rows() + 157 * n_cols());
 
  iterator i(this);
  for (int c = 0; c < n_cols(); c++)
    {
      int count = 0;  // only use first 2 non-zero entries in each column
      for (i.set(c); i.valid(); i.next())
        {
          hashval = 34224 * hashval + get_ring()->computeHashValue(i.entry());
          if (++count > 2) break;
        }
    }
  return hashval;
}

References computeHashValue(), Matrix::iterator::entry(), get_ring(), n_cols(), n_rows(), Matrix::iterator::next(), Matrix::iterator::set(), and Matrix::iterator::valid().

Referenced by computeHashValue(), and MatrixConstructor.