/* Complex.java
*
* Copyright (C) 1997-2007 Stephan Michels <stephan@vern.chem.tu-berlin.de>
*
* Contact: cdk-devel@lists.sourceforge.net
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
* All we ask is that proper credit is given for our work, which includes
* - but is not limited to - adding the above copyright notice to the beginning
* of your source code files, and to any copyright notice that you may distribute
* with programs based on this work.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
* */
package org.openscience.cdk.math;
/**
* This class handles complex values.
*
* @cdk.module qm
*/
public class Complex
{
/** The real part of this value */
public double real = 0;
/** The imaginary part of this value */
public double imag = 0;
/**
* Creates a complex number
*
* @param real the real part
* @param imag the imaginary part
*/
public Complex(double real, double imag)
{
this.real = real;
this.imag = imag;
}
/**
* Creates a copy of a complex object
*/
public Complex(Complex c)
{
real = c.real;
imag = c.imag;
}
/**
* Sets the real part of this complex value
*/
public void setRealPart(double real)
{
this.real = real;
}
/**
* Gets the real part of this complex value
*/
public double getRealPart()
{
return real;
}
/**
* Sets the imaginary part of this value
*/
public void setImaginaryPart(double imag)
{
this.imag = imag;
}
/**
* Gets the imaginary part of this value
*/
public double getImaginaryPart()
{
return imag;
}
/**
* Add a complex value
*/
public void add(Complex c)
{
real += c.real;
imag += c.imag;
}
/**
* Subtracs a complex value
*/
public void sub(Complex c)
{
real -= c.real;
imag -= c.imag;
}
/**
* Multiply this value with a complex value
*/
public void mul(Complex c)
{
double newreal = real*c.real-imag*c.imag;
double newimag = real*c.imag+imag*c.real;
real = newreal;
imag = newimag;
}
/**
* Div this value by a complex value
*/
public void div(Complex c)
{
double modulus = c.real*c.real+c.imag*c.imag;
double newreal = imag*c.imag+real*c.real;
double newimag = imag*c.real-real*c.imag;
real = newreal/modulus;
imag = newimag/modulus;
}
/**
* Create a string of the content of this class
*/
public String toString()
{
return "("+real+"+i*"+imag+")";
}
}
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