import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.Random;

import java.lang.StringBuilder;

public class Gnuplot

{

private int MAX = 8;

private double[] a = new double[MAX];

private double[] b = new double[MAX];

private Random fRandom = new Random();

public double getGaussian(double aMean, double aVariance)

{

return aMean + fRandom.nextGaussian() * aVariance;

}

double MEAN1 = 200.0f;

double VARIANCE1 = 20.0f;

double MEAN2 = 300.0f;

double VARIANCE2 = 30.0f;

public void generate()

{

for (int i = 0; i < MAX; i++)

{

a[i] = getGaussian(MEAN1, VARIANCE1);

b[i] = 5.0 - 2.0*a[i] + getGaussian(MEAN2, VARIANCE2);

}

}

String command;

public void buildCommand()

{

StringBuilder s = new StringBuilder("echo ");

for (int i = 0; i < MAX; i++)

{

s.append(a[i]).append(" ").append(b[i]);

if(i < MAX - 1) s.append("\n");

}

s.append(" | feedgnuplot\n");

command = s.toString();

}

public static void main(String[] args)

{

Gnuplot gobj = new Gnuplot();

gobj.generate();

gobj.buildCommand();

System.out.println(gobj.command);

String output = gobj.plot();

//System.out.println(output);

}

public String plot()

{

StringBuffer output = new StringBuffer();

Process p;

try

{

p = Runtime.getRuntime().exec(command);

p.waitFor();

BufferedReader reader =

new BufferedReader(new InputStreamReader(p.getInputStream()));

String line = "";

while ((line = reader.readLine())!= null)

output.append(line + "\n");

}

catch (Exception e)

{

e.printStackTrace();

}

return output.toString();

}

}