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Java > Open Source Codes > JSci > maths > analysis > Cosine


1 package JSci.maths.analysis;
2
3 /**
4 * The cosine function.
5 * @version 1.1
6 * @author Mark Hale
7 */
8 public class Cosine extends RealFunction {
9         private final double A, w, k;
10         /**
11         * Constructs a cosine function of the form <code>cos(x)</code>.
12         */
13         public Cosine() {
14         this(1.0, 1.0, 0.0);
15         }
16         /**
17         * Constructs a cosine function of the form <code>A cos(wx+k)</code>.
18         */
19         public Cosine(double A, double w, double k) {
20         this.A = A;
21         this.w = w;
22         this.k = k;
23         }
24         public double map(double x) {
25                 return A*Math.cos(w*x+k);
26         }
27         public RealFunction differentiate() {
28         return new Sine(-A*w, w, k);
29         }
30 }
31
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