7. แถวลำดับ

import jlab.graphics.DWindow;

public class LineGraph {
  public static void main(String[] args) {
    int n = 200;
    double[] x = new double[n];
    double[] y = new double[n];  
    for (int i = 0; i < x.length; i++) {
      x[i] = -10 + i * 0.1;
      for (int k = 1; k <= 4; k++) {
        y[i] += Math.sin(k * x[i]);
      }
    }
    plot(300, 200, x, y);
  }
  public static void plot(int width, int height,
                          double[] x, double[] y) {
    DWindow w = new DWindow(width, height);
    double xmin = min(x);
    double xmax = max(x);
    double ymin = min(y);
    double ymax = max(y);
    for (int i = 0; i < x.length - 1; i++) {
      double sx0 = toScreen(x[i],   xmin, xmax, width);
      double sx1 = toScreen(x[i+1], xmin, xmax, width);
      double sy0 = toScreen(y[i],   ymax, ymin, height);
      double sy1 = toScreen(y[i+1], ymax, ymin, height);
      w.drawLine(w.BLACK, sx0, sy0, sx1, sy1);
    }
  }
  private static double toScreen(double v, double min,
                                double max, double length) {
    return (v - min) * (length-1) / (max - min);
  }
  public static double max(double[] d) { ... } // รหัสที่ 7-8
  public static double min(double[] d) { ... } // ลองเขียนเอง 
}