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.gene.tetrad.gene.algorithm.util;
  
  /**
   * Implements a Matrix of elements of type <code>float</code>
   *
   * @author
   * <a href="http://www.eecs.tulane.edu/Saavedra" target="_TOP">Raul Saavedra</a>
   * (<a href="mailto:rsaavedr@ai.uwf.edu">rsaavedr@ai.uwf.edu</A>)
   */
  
  import java.io.FileNotFoundException;
  import java.io.IOException;
  
  public class MatrixF extends BasicMatrix {
      protected float[][] A;
  
      /**
       * Creates a matrix with name <code>mname</code>, and <code>nrows</code>
       * rows.
       */
      public MatrixF(String mname, int nrows) {
          super(mname, nrows);
      }
  
      /**
       * Creates a matrix reading it from a file <code>fname</code>. The file has
       * to be an ascii one and follow a particular format:<p> *MATRIX*  [matrix
       * name] <br> [n]<br> [0, 0 ] [ 0, 1] ...  [ 0, n-1]<br> [1, 0 ] [ 1, 1] ...
       * [ 1, n-1]<br> :<br> [n-1,0] [n-1,1] ...  [n-1,n-1]<p> </p> First token
       * should be a word with "MATRIX" as a substring (case insens.), followed by
       * the name of the matrix (one word). [n] is the number of rows and columns
       * in the matrix, and [i,j] is element at position i,j in the matrix.<br>
       * For example, a 3x3 identity matrix could be represented as follows:<p>
       * </p> MATRIX Identity3x3<br> <br> 3  // # rows and columns<br> <br> //
       * Matrix elements:<br> 1 0 0<br> 0 1 0<br> 0 0 1<p> </p> Notice there can
       * be slash-slash (and also slash-star) style comments anywhere in the file.
       * Numbers can be separated by any number of blank delimiters: tabs, spaces,
       * carriage returns.  In the examples above they appear in different lines
       * for more readability of the file. The file may have less elements than
       * the total needed to fill the matrix.  If it has more elements an illegal
       * argument exception will be generated.
       */
      public MatrixF(String fname) throws FileNotFoundException, IOException {
          super(fname);
      }
  
      /**
       * Initializes the data structure used to hold the contents of the matrix
       */
      protected void initMatrixStorage() {
          this.A = new float[this.n][this.n];
      }
  
      /**
       * Casts double value x to float and assigns it to element (r,c)
       */
      public void setDoubleValue(int r, int c, double x) {
          if ((r >= this.n) || (c >= this.n) || (r < 0) || (c < 0)) {
              badIndexXcp(r, c);
          }
          if ((x < MIN_FLOAT) || (x > MAX_FLOAT)) {
              throw new IllegalArgumentException(
                      "Integer " + x + " cannot be stored as a float");
          }
          this.A[r][c] = (float) x;
      }
  
      /**
       * Returns the value stored at element (r,c) as a double
       */
      public double getDoubleValue(int r, int c) {
          if ((r >= this.n) || (c >= this.n) || (r < 0) || (c < 0)) {
              badIndexXcp(r, c);
          }
          return (double) this.A[r][c];
      }
  
      /**
       * Assigns float x to matrix element at (r, c)
       */
      public void setValue(int r, int c, float x) {
          if ((r >= this.n) || (c >= this.n) || (r < 0) || (c < 0)) {
              badIndexXcp(r, c);
          }
          this.A[r][c] = x;
      }
  
      /**
       * Assigns double x to matrix element at (r, c).  This method checks that
       * the double x can be converted to a float without causing overflow.
       */
      public void setValue(int r, int c, double x) {
          if ((x < MIN_FLOAT) || (x > MAX_FLOAT)) {
              throw new IllegalArgumentException(
                      "Integer " + x + " cannot be stored as a float");
          }
          if ((r >= this.n) || (c >= this.n) || (r < 0) || (c < 0)) {
              badIndexXcp(r, c);
          }
          this.A[r][c] = (float) x;
      }
  
      /**
       * Returns the value stored at element (r,c)
       */
      public float getValue(int r, int c) {
          if ((r >= this.n) || (c >= this.n) || (r < 0) || (c < 0)) {
              badIndexXcp(r, c);
          }
          return this.A[r][c];
      }
  
      /**
       * Assign zero to all elements in the matrix
       */
      public void setAllValuesToZero() {
          for (int i = 0; i < this.n; i++) {
              for (int j = 0; j < this.n; j++) {
                  A[i][j] = 0;
              }
          }
      }
  
  }
  
  
  
  
  
  