// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 13-2: Random number distribution
  
  // An array to keep track of how often random numbers are picked.
  float[] randomCounts;
  
  void setup() {
    size(200,200);
    randomCounts = new float[20];
  }
  
  void draw() {
    background(255);
    
    // Pick a random number and increase the count
    int index = int(random(randomCounts.length));
    randomCounts[index] ++ ;
    
    // Draw a rectangle to graph results
    stroke(0);
    fill(175);
    for (int x = 0; x < randomCounts.length; x ++ ) {
      rect(x*10,0,9,randomCounts[x]);
    }
  }