@Override public String toString(){
  if (m_eigenvalues == null) {
    return "Principal components hasn't been built yet!";
  }
 else {
    return "\tPrincipal Components Attribute Transformer\n\n" + principalComponentsSummary();
  }
}

@ Override public String toString ( ) { if ( m_eigenvalues == null ) { return "Principal components hasn't been built yet!" ; } else { return "\tPrincipal Components Attribute Transformer\n\n" + principalComponentsSummary ( ) ; } }
returns a description of this attribute transformer
