/**
* Plots the line segments connecting
* (<em>i</em>, <em>a</em><sub><em>i</em></sub>) to
* (<em>i</em>+1, <em>a</em><sub><em>i</em>+1</sub>) for
* each <em>i</em> to standard draw.
*
* @param a the array of values
*/
public static void plotLines(double[] a) {
validateNotNull(a);
int n = a.length;
StdDraw.setXscale(-1, n);
StdDraw.setPenRadius();
for (int i = 1; i < n; i++) {
StdDraw.line(i-1, a[i-1], i, a[i]);
}
}
/**
* Plots the points (0, <em>a</em><sub>0</sub>), (1, <em>a</em><sub>1</sub>), ...,
* (<em>n</em>-1, <em>a</em><sub><em>n</em>-1</sub>) to standard draw.
*
* @param a the array of values
*/
public static void plotPoints(double[] a) {
validateNotNull(a);
int n = a.length;
StdDraw.setXscale(-1, n);
StdDraw.setPenRadius(1.0 / (3.0 * n));
for (int i = 0; i < n; i++) {
StdDraw.point(i, a[i]);
}
}
