ej.numeric.signal

Class Transforms

java.lang.Object

ej.numeric.signal.Transforms

public class Transforms
extends java.lang.Object

Transforms algorithms

Constructor Summary

Constructors

Constructor and Description
Transforms()

Method Summary

Methods

Modifier and Type	Method and Description
static ComplexDoubleMatrix	fft(ComplexDoubleMatrix X) Fast Fourier transform
static ComplexDoubleMatrix	fft(ComplexDoubleMatrix X, ComplexDoubleMatrix R) Fast Fourier transform
static ComplexFloatMatrix	fft(ComplexFloatMatrix X) Fast Fourier transform
static ComplexFloatMatrix	fft(ComplexFloatMatrix X, ComplexFloatMatrix R) Fast Fourier transform
static ComplexDoubleMatrix	fft(DoubleMatrix X) Fast Fourier transform
static ComplexDoubleMatrix	fft(DoubleMatrix X, ComplexDoubleMatrix R) Fast Fourier transform
static ComplexFloatMatrix	fft(FloatMatrix X) Fast Fourier transform
static ComplexFloatMatrix	fft(FloatMatrix X, ComplexFloatMatrix R) Fast Fourier transform
static ComplexDoubleMatrix	ifft(ComplexDoubleMatrix X) Inverse fast Fourier transform
static ComplexDoubleMatrix	ifft(ComplexDoubleMatrix X, ComplexDoubleMatrix R) Inverse fast Fourier transform
static ComplexFloatMatrix	ifft(ComplexFloatMatrix X) Inverse fast Fourier transform
static ComplexFloatMatrix	ifft(ComplexFloatMatrix X, ComplexFloatMatrix R) Inverse fast Fourier transform

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Transforms

public Transforms()

Method Detail

fft

public static ComplexFloatMatrix fft(FloatMatrix X)

Fast Fourier transform

Parameters:

X - Input Real vector. If the input is a matrix, returns the Fourier transform of each column of the matrix.

Returns:

New Complex matrix with the result of the operation

Throws:

java.lang.IllegalArgumentException - : if the size is greater than 8192. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexFloatMatrix fft(FloatMatrix X,
                     ComplexFloatMatrix R)

Fast Fourier transform

Parameters:

X - Input Real vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

R - Output Complex vector. R contains the result the Fourier transform of X

Returns:

R

Throws:

IllegalArguementException - if R and X are not the same size.

java.lang.IllegalArgumentException - : if the size is greater than 8192. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexDoubleMatrix fft(DoubleMatrix X)

Fast Fourier transform

Parameters:

X - Input Real vector. If the input is a matrix, returns the Fourier transform of each column of the matrix.

Returns:

New Complex matrix with the result of the operation

Throws:

java.lang.IllegalArgumentException - : if the size is greater than 8192. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexDoubleMatrix fft(DoubleMatrix X,
                      ComplexDoubleMatrix R)

Fast Fourier transform

Parameters:

X - Input Real vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

R - Output Complex vector. R contains the result the Fourier transform of X

Returns:

R

Throws:

IllegalArguementException - if R and X are not the same size.

java.lang.IllegalArgumentException - : if the size is greater than 8192. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexFloatMatrix fft(ComplexFloatMatrix X)

Fast Fourier transform

Parameters:

X - Input/Output Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

Returns:

X (X contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexFloatMatrix fft(ComplexFloatMatrix X,
                     ComplexFloatMatrix R)

Fast Fourier transform

Parameters:

X - Input Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

R - Output Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

Returns:

R (R contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

java.lang.IllegalArgumentException - if X and R has not the same size

ifft

public static ComplexFloatMatrix ifft(ComplexFloatMatrix X)

Inverse fast Fourier transform

Parameters:

X - Input/Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

Returns:

X (X contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

ifft

public static ComplexFloatMatrix ifft(ComplexFloatMatrix X,
                      ComplexFloatMatrix R)

Inverse fast Fourier transform

Parameters:

X - Input/Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

R - Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

Returns:

R (R contains the result of the operation).

Throws:

java.lang.IllegalArgumentException - : if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

java.lang.IllegalArgumentException - if X and R has not the same size

fft

public static ComplexDoubleMatrix fft(ComplexDoubleMatrix X)

Fast Fourier transform

Parameters:

X - Input/Output Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

Returns:

X (X contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

fft

public static ComplexDoubleMatrix fft(ComplexDoubleMatrix X,
                      ComplexDoubleMatrix R)

Fast Fourier transform

Parameters:

X - Input Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

R - Output Complex vector. If the input is a matrix, compute the Fourier transform of each column of the matrix.

Returns:

R (R contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

java.lang.IllegalArgumentException - if X and R has not the same size

ifft

public static ComplexDoubleMatrix ifft(ComplexDoubleMatrix X)

Inverse fast Fourier transform

Parameters:

X - Input/Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

Returns:

X (X contains the result of the operation).

Throws:

IllegalArgumentException: - if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

ifft

public static ComplexDoubleMatrix ifft(ComplexDoubleMatrix X,
                       ComplexDoubleMatrix R)

Inverse fast Fourier transform

Parameters:

X - Input/Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

R - Output vector. If the input is a matrix, compute the inverse Fourier transform of each column of the matrix.

Returns:

R (R contains the result of the operation).

Throws:

java.lang.IllegalArgumentException - : if the size is greater than 4096. (when the size is a power of two) if the size is greater than 2049. (when the size is not a power of two) If X is a vector size is equal to the length of X, X is a matrix size is equal to the number of rows of X

java.lang.IllegalArgumentException - if X and R has not the same size