code: ///////////////////////////////////////////////////////////////////////////////
  // For information as to what this class does, see the Javadoc, below.       //
  // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,       //
  // 2007, 2008, 2009, 2010, 2014, 2015 by Peter Spirtes, Richard Scheines, Joseph   //
  // Ramsey, and Clark Glymour.                                                //
  //                                                                           //
  // This program is free software; you can redistribute it and/or modify      //
  // it under the terms of the GNU General Public License as published by      //
  // the Free Software Foundation; either version 2 of the License, or         //
  // (at your option) any later version.                                       //
  //                                                                           //
  // This program is distributed in the hope that it will be useful,           //
  // but WITHOUT ANY WARRANTY; without even the implied warranty of            //
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
  // GNU General Public License for more details.                              //
  //                                                                           //
  // You should have received a copy of the GNU General Public License         //
  // along with this program; if not, write to the Free Software               //
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA //
  ///////////////////////////////////////////////////////////////////////////////
  
  package edu.cmu.tetrad.util;
  
  /**
   * Implements an n-dimensional point.
   *
   * @author Joseph Ramsey
   */
  public class Point implements Comparable {
  
      /**
       * A vector representing the point coordinates.
       */
      private final TetradVector vector;
  
      /**
       * Constructs a point with coordinates as in the given vector.
       *
       * @param vector a vector representing the point coordinates, in order.
       */
      public Point(TetradVector vector) {
          this.vector = vector.copy();
      }
  
      /**
       * @param index Ibid.
       * @return Ibid.
       */
      public double getValue(int index) {
          return vector.get(index);
      }
  
      /**
       * @return Ibid.
       */
      public int getSize() {
          return vector.size();
      }
  
      /**
       * True iff the given object is a point with the same coordinates as
       * this one.
       *
       * @param o Ibid.
       * @return Ibid.
       */
      public int compareTo(Object o) {
          if (o == this) {
              return 0;
          }
  
          Point p = (Point) o;
  
          for (int i = 0; i < getSize(); i++) {
              if (getValue(i) != p.getValue(i)) {
                  return (int) Math.signum(p.getValue(i) - getValue(i));
              }
          }
  
          return 0;
      }
  
      /**
       * @return Ibid.
       */
      public String toString() {
          StringBuilder buf = new StringBuilder();
  
          buf.append("<");
  
          for (int i = 0; i < getSize(); i++) {
              buf.append(getValue(i));
  
              if (i < getSize() - 1) {
                  buf.append(", ");
              }
          }
  
          buf.append(">");
          return buf.toString();
      }
  
      /**
       * @return Ibid.
       */
      public TetradVector getVector() {
          return this.vector.copy();
      }
  }
  
  
  
  
  