mathutil.java

这是一个十分有用的java图形工具包

package net.turbochen.graph.util;

import java.text.NumberFormat;

/**
 * 提供数学统计工具.
 * @author Turbo Chen
 */
public class MathUtil
{

    public static double max(double[] d) throws InvalidDataException
    {
        if ( d == null ) throw new InvalidDataException();
        double temp = d[0];
        for ( int i = 0;i<d.length;i++ )
        {
           if (d[i] > temp ) temp = d[i];
        }
        return temp;
    }
    
    public static double min(double[] d) throws InvalidDataException
    {
        if ( d == null ) throw new InvalidDataException();        
        double temp = d[0];
        for ( int i = 0;i<d.length;i++ )
        {
           if (d[i] < temp ) temp = d[i];
        }
        return temp;
    }

    public static int max(int[] d) throws InvalidDataException
    {
        if ( d == null ) throw new InvalidDataException();        
        if ( d == null ) throw new InvalidDataException();        
        int temp = d[0];
        for ( int i = 0;i<d.length;i++ )
        {
           if (d[i] > temp ) temp = d[i];
        }
        return temp;
    }
    
    public static int min(int[] d) throws InvalidDataException
    {
        if ( d == null ) throw new InvalidDataException();        
        if ( d == null ) throw new InvalidDataException();        
        if ( d == null ) throw new InvalidDataException();        
        int temp = d[0];
        for ( int i = 0;i<d.length;i++ )
        {
           if (d[i] < temp ) temp = d[i];
        }
        return temp;
    }
    
    public static String format(double value,String pattern)
    {
        java.text.DecimalFormat df = new java.text.DecimalFormat(pattern);
        return df.format(value);
    }
    
}