Source Code Cross Referenced for PowerFunction2D.java in  » Chart » jfreechart » org » jfree » data » function » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.data.function 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /* ===========================================================
02:         * JFreeChart : a free chart library for the Java(tm) platform
03:         * ===========================================================
04:         *
05:         * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
06:         *
07:         * Project Info:  http://www.jfree.org/jfreechart/index.html
08:         *
09:         * This library is free software; you can redistribute it and/or modify it 
10:         * under the terms of the GNU Lesser General Public License as published by 
11:         * the Free Software Foundation; either version 2.1 of the License, or 
12:         * (at your option) any later version.
13:         *
14:         * This library is distributed in the hope that it will be useful, but 
15:         * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
16:         * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
17:         * License for more details.
18:         *
19:         * You should have received a copy of the GNU Lesser General Public
20:         * License along with this library; if not, write to the Free Software
21:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
22:         * USA.  
23:         *
24:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
25:         * in the United States and other countries.]
26:         *
27:         * --------------------
28:         * PowerFunction2D.java
29:         * --------------------
30:         * (C) Copyright 2002-2005, by Object Refinery Limited.
31:         *
32:         * Original Author:  David Gilbert (for Object Refinery Limited);
33:         * Contributor(s):   -;
34:         *
35:         * $Id: PowerFunction2D.java,v 1.3.2.1 2005/10/25 21:31:32 mungady Exp $
36:         *
37:         * Changes:
38:         * --------
39:         * 01-Oct-2002 : Version 1 (DG);
40:         *
41:         */
42:
43:        package org.jfree.data.function;
44:
45:        /**
46:         * A function of the form y = a * x ^ b.
47:         */
48:        public class PowerFunction2D implements  Function2D {
49:
50:            /** The 'a' coefficient. */
51:            private double a;
52:
53:            /** The 'b' coefficient. */
54:            private double b;
55:
56:            /**
57:             * Creates a new power function.
58:             *
59:             * @param a  the 'a' coefficient.
60:             * @param b  the 'b' coefficient.
61:             */
62:            public PowerFunction2D(double a, double b) {
63:                this .a = a;
64:                this .b = b;
65:            }
66:
67:            /**
68:             * Returns the value of the function for a given input ('x').
69:             *
70:             * @param x  the x-value.
71:             *
72:             * @return The value.
73:             */
74:            public double getValue(double x) {
75:                return this.a * Math.pow(x, this.b);
76:            }
77:
78:        }
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