edu.cmu.sphinx.util
Class Complex

java.lang.Object
  edu.cmu.sphinx.util.Complex

public class Complex
extends java.lang.Object

Implements complex types and arythmetics

Constructor Summary

Complex()
Create a default complex number

Complex(double real)
Create a complex number from a real one

Complex(double real, double imaginary)
Create a complex number from the real and imaginary parts

Method Summary

void	addComplex(Complex a, Complex b) Method to add two complex numbers.
void	divideComplex(Complex a, Complex b) Method to divide two complex numbers.
double	getImaginary() Returns the imaginary part of this Complex number.
double	getReal() Returns the real part of this Complex number.
void	multiplyComplex(Complex a, Complex b) Method to multiply two complex numbers.
void	reset() Sets both the real and imaginary parts of this complex number to zero.
void	scaleComplex(Complex a, double b) Method to scale a complex number by a real one.
void	set(double real, double imaginary) Sets the real and imaginary parts of this complex number.
double	squaredMagnitudeComplex() Method to compute the squared magnitude of a complex number.
void	subtractComplex(Complex a, Complex b) Method to subtract two complex numbers.
java.lang.String	toString() Returns this complex number as a string in the format (real, imaginary).

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Complex

public Complex()

Create a default complex number

Complex

public Complex(double real)

Create a complex number from a real one

Complex

public Complex(double real,
               double imaginary)

Create a complex number from the real and imaginary parts

Method Detail

getReal

public double getReal()

Returns the real part of this Complex number.

Returns:

the real part

getImaginary

public double getImaginary()

Returns the imaginary part of this Complex number.

Returns:

the imaginary part

reset

public void reset()

Sets both the real and imaginary parts of this complex number to zero.

set

public void set(double real,
                double imaginary)

Sets the real and imaginary parts of this complex number.

Parameters:

real - the value of the real part

imaginary - the value of the imaginary part

addComplex

public void addComplex(Complex a,
                       Complex b)

Method to add two complex numbers.

Parameters:

a - the first element to be added

b - the second element to be added

subtractComplex

public void subtractComplex(Complex a,
                            Complex b)

Method to subtract two complex numbers.

Parameters:

a - the element we subtract from

b - the element to be subtracted

multiplyComplex

public void multiplyComplex(Complex a,
                            Complex b)

Method to multiply two complex numbers.

Parameters:

a - the first element to multiply

b - the second element to multiply

divideComplex

public void divideComplex(Complex a,
                          Complex b)

Method to divide two complex numbers. To divide two complexes, we multiply by the complex conjugate of the denominator, thus resulting in a real number in the denominator.

Parameters:

a - the numerator

b - the denominator

scaleComplex

public void scaleComplex(Complex a,
                         double b)

Method to scale a complex number by a real one. The input complex number is modified in place.

Parameters:

a - the complex number

b - the real scaling factor

squaredMagnitudeComplex

public double squaredMagnitudeComplex()

Method to compute the squared magnitude of a complex number.

Returns:

the squared magnitude of the complex number

toString

public java.lang.String toString()

Returns this complex number as a string in the format (real, imaginary).

Overrides:

toString in class java.lang.Object