offstage.cleanse.Hist.java Source code

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Here is the source code for offstage.cleanse.Hist.java

Source

/*
OffstageArts: Enterprise Database for Arts Organizations
This file Copyright (c) 2005-2008 by Robert Fischer
    
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 3 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, see <http://www.gnu.org/licenses/>.
*/
/*
 * Hist.java
 *
 * Created on November 3, 2007, 9:19 PM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package offstage.cleanse;

import java.util.Arrays;
import org.apache.commons.collections.ArrayStack;

import java.text.*;

/**
 * For making histograms
 * @author citibob
 */
public class Hist {

    NumberFormat nfmt = new DecimalFormat("#0.00");

    double[] cat;
    int[] count;
    int tot;

    /** Creates a new instance of Hist */
    public Hist(double low, double high, int ncat) {
        cat = new double[ncat];
        double delta = (high - low) / ncat;
        for (int i = 0; i < ncat; ++i) {
            cat[i] = low + i * delta;
        }
        count = new int[ncat];
    }

    public void add(double d) {
        int ix = Arrays.binarySearch(cat, d);
        if (ix >= 0)
            ++count[ix];
        else
            ++count[-(ix + 2)];
        ++tot;
    }

    public String toString() {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < cat.length; ++i) {
            sb.append(nfmt.format(cat[i]) + ": " + count[i] + " " + nfmt.format((double) count[i] / (double) tot)
                    + "\n");
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        Hist h = new Hist(0, 1.0, 10);
        h.add(0);
        h.add(.1);
        h.add(.055);
        h.add(1);
        h.add(2);
        System.out.println(h.toString());
    }
}