transforms.h File Reference

Fourier, Hadamard, Walsh-Hadamard, and 2D Hadamard transforms - header file. More...

`#include <itpp/base/vec.h>`
`#include <itpp/base/mat.h>`
`#include <itpp/base/matfunc.h>`
`#include <itpp/itexports.h>`

Go to the source code of this file.

## Namespaces

namespace | itpp
| itpp namespace

## Functions

ITPP_EXPORT bool | itpp::have_fourier_transforms ()
| Run-time test if library is built with Fast Fourier Transforms enabled.
ITPP_EXPORT void | itpp::fft (const cvec &in, cvec &out)
| Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::fft (const cvec &in)
| Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::fft (const cvec &in, const int N)
| Fast Fourier Transform with zero-padding up to size N.
ITPP_EXPORT void | itpp::ifft (const cvec &in, cvec &out)
| Inverse Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::ifft (const cvec &in)
| Inverse Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::ifft (const cvec &in, const int N)
| Inverse Fast Fourier Transform with zero-padding up to size N.
ITPP_EXPORT void | itpp::fft_real (const vec &in, cvec &out)
| Real Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::fft_real (const vec &in)
| Real Fast Fourier Transform.
ITPP_EXPORT cvec | itpp::fft_real (const vec &in, const int N)
| Real Fast Fourier Transform with zero-padding up to size N.
ITPP_EXPORT void | itpp::ifft_real (const cvec &in, vec &out)
| Inverse Real Fast Fourier Transform.
ITPP_EXPORT vec | itpp::ifft_real (const cvec &in)
| Inverse Real Fast Fourier Transform.
ITPP_EXPORT vec | itpp::ifft_real (const cvec &in, const int N)
| Inverse Real Fast Fourier Transformon with zero-padding up to size N.
ITPP_EXPORT bool | itpp::have_cosine_transforms ()
| Run-time test if library is built with cosine transforms enabled.
ITPP_EXPORT void | itpp::dct (const vec &in, vec &out)
| Discrete Cosine Transform (DCT).
ITPP_EXPORT vec | itpp::dct (const vec &in)
| Discrete Cosine Transform (DCT).
ITPP_EXPORT vec | itpp::dct (const vec &in, const int N)
| Discrete Cosine Transform (DCT) with zero-padding up to size N.
ITPP_EXPORT void | itpp::idct (const vec &in, vec &out)
| Inverse Discrete Cosine Transform (IDCT).
ITPP_EXPORT vec | itpp::idct (const vec &in)
| Inverse Discrete Cosine Transform (IDCT).
ITPP_EXPORT vec | itpp::idct (const vec &in, const int N)
| Inverse Discrete Cosine Transform (IDCT) with zero-padding up to size N.
template<class T>
Vec< T > | itpp::dht (const Vec< T > &v)
| Fast Hadamard Transform.
template<class T>
void | itpp::dht (const Vec< T > &vin, Vec< T > &vout)
| Fast Hadamard Transform.
template<class T>
void | itpp::self_dht (Vec< T > &v)
| Fast Hadamard Transform - memory efficient. Stores the result in `v`.
template<class T>
Vec< T > | itpp::dwht (const Vec< T > &v)
| Fast Walsh Hadamard Transform.
template<class T>
void | itpp::dwht (const Vec< T > &vin, Vec< T > &vout)
| Fast Walsh Hadamard Transform.
template<class T>
void | itpp::self_dwht (Vec< T > &v)
| Fast Walsh Hadamard Transform - memory efficient (result in `v`).
template<class T>
Mat< T > | itpp::dht2 (const Mat< T > &m)
| Fast 2D Hadamard Transform.
template<class T>
Mat< T > | itpp::dwht2 (const Mat< T > &m)
| Fast 2D Walsh Hadamard Transform.
template<class T>
void | itpp::bitrv (Vec< T > &out)
| Bit reverse.

## Detailed Description

Fourier, Hadamard, Walsh-Hadamard, and 2D Hadamard transforms - header file.

Author
  Tony Ottosson, Thomas Eriksson, Simon Wood, Adam Piatyszek, Andy Panov and Bogdan Cristea

Copyright (C) 1995-2013 (see AUTHORS file for a list of contributors)

This file is part of IT++ - a C++ library of mathematical, signal processing, speech processing, and communications classes and functions.

IT++ is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

IT++ 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with IT++. If not, see http://www.gnu.org/licenses/.

Definition in file transforms.h.

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