/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools.math;
/**
* A class for complex numbers which consists of a real and an imaginary part.
*
* @author Ingo Mierswa
* @version $Id: Complex.java,v 1.3 2008/05/09 19:23:03 ingomierswa Exp $
*/
public class Complex implements Comparable {
private double real, imaginary;
public Complex(double real, double imaginary) {
this.real = real;
this.imaginary = imaginary;
}
public double getReal() {
return real;
}
public double getImaginary() {
return imaginary;
}
public double getLength() {
return Math.sqrt(real * real + imaginary * imaginary);
}
/**
* Normalizes the amplitude to the correct value. <code>n</code> must be
* the total used size, i.e. <code>nyquist * 2</code>.
*/
public double getMagnitude(int n) {
return (2.0d * Math.sqrt(real * real + imaginary * imaginary)) / n;
}
public int compareTo(Object o) {
Complex c = (Complex) o;
return Double.compare(this.real, c.real);
}
public boolean equals(Object o) {
if (!(o instanceof Complex)) {
return false;
} else {
Complex c = (Complex)o;
return (this.real == c.real) && (this.imaginary == c.imaginary);
}
}
public int hashCode() {
return Double.valueOf(this.real).hashCode() ^ Double.valueOf(this.imaginary).hashCode();
}
public String toString() {
return "y = " + real + " + " + imaginary + " * i";
}
}