/**
* Copyright (C) 2001-2017 by RapidMiner and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapidminer.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
*/
public class Complex implements Comparable<Complex> {
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;
}
@Override
public int compareTo(Complex o) {
return Double.compare(this.real, o.real);
}
@Override
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);
}
}
@Override
public int hashCode() {
return Double.valueOf(this.real).hashCode() ^ Double.valueOf(this.imaginary).hashCode();
}
@Override
public String toString() {
return "y = " + real + " + " + imaginary + " * i";
}
}