/*
 * This material is distributed under the GNU General Public License
 * Version 2. You may review the terms of this license at
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * Copyright (c) 1995, 1996  Robert Gentleman and Ross Ihaka
 * Copyright (c) 1997-2013, The R Core Team
 * Copyright (c) 2015, Oracle and/or its affiliates
 *
 * All rights reserved.
 */