# Fast fourier transformation in c

The following C project contains the C source code and C examples used for fast fourier transformation. This program will sample sound from your
Audiodevice and apply a Fouriertransformation
to the sample buffer.

The following Matlab project contains the source code and Matlab examples used for fourier cosine integral.
These functions calculate the Fourier Cosine and Sine Integrals.
y = integral from 0 to x of cos(pi/2 * t.^2) dt
and
y = integral from 0 to x of sin(pi/2 * t.^2) dt

The following Matlab project contains the source code and Matlab examples used for gaver stehfest algorithm for inverse laplace transform.
%
% ilt=gavsteh(funname,t,L)
%
% funname The name of the function to be transformed.

The following Matlab project contains the source code and Matlab examples used for fast bispectrum estimation .
Fast bispectrum (dll optimized) estimation

The following Matlab project contains the source code and Matlab examples used for regularized inverse laplace transform .
rilt Regularized Inverse Laplace Transform
[g,yfit,cfg] = rilt(t,y,s,g0,alpha)
Array g(s) is the Inverse Laplace Transform of the array y(t), calculated by a regularized least squares method.

The following Matlab project contains the source code and Matlab examples used for stationary phase approximation for performing fourier transforms.
This function allows one to calculate the Fourier transform of a chirped function evaluated at specific points using the stationary phase approximation.

The following Matlab project contains the source code and Matlab examples used for demonstration of fourier transformation.
These are two M-files “fourier1” and “fourier2” The first is designed to demonstrate how triangular, rectangular, saw tooth, half wave and full wave rectified signals can be built from superposition of a predefined no of Fourier harmonic terms.

The following Matlab project contains the source code and Matlab examples used for displays a two dimensional discrete fourier transformation..
Easy to use display function for analyzing the FFT of tow-dimensional signals.

The following Matlab project contains the source code and Matlab examples used for inverse laplace transform by gaver stehfest algorithm.
Perform inverse Laplace Transform by Gaver-Stehfest algorithm or an arbitrary function and their parameters.

The following Matlab project contains the source code and Matlab examples used for fourier derivative.
Spectral methods of solving partial differential equations may involve the use of a Fourier transform to compute derivatives.

The following Matlab project contains the source code and Matlab examples used for inverse laplace transform function.
INVLAPFUN Time Function from Laplace Transform.

The following Matlab project contains the source code and Matlab examples used for for signal processing fractional fourier transform matlab source code. members wish to be useful .
Fractional Fourier transform, chirp signal decomposition-type realization of fractional Fourier transform

The following Matlab project contains the source code and Matlab examples used for fourier transform for xmds .
Calculate the FT according to:
\int dx * f(x) * exp(-i*k*x)
x = -L/2:dx:L/2-dx

The following Matlab project contains the source code and Matlab examples used for inverse fourier transform for xmds.
Calculate Inverse Fourier transform according to
1/(2*pi) \int dk f(k) * exp(i*k*x)
x = -L/2:dx:L/2-dx.
k = -kmax:dk:kmax-dk,
dk = 2*pi/L, kmax = pi/dx;

The following Matlab project contains the source code and Matlab examples used for fourier transform application. .
This based Fourier transform GUI application demonstrate ways to generate Fourier transform to an input signal and modify some specifications to make program more flexible to more signals.

The following Matlab project contains the source code and Matlab examples used for stockwell transform (s transform).
This code computes the Stockwell transform (S-Transform) of a one dimensional series without for loop, thereby making it computationally fast and simple. S-Transform was proposed in 1996. A nice tutorial on S-Transform can be found here:
djj.ee.ntu.edu.tw/S_Transform.pdf

The following Matlab project contains the source code and Matlab examples used for inverse laplace transform of transfer function class.
Inverse Laplace Transform Calculator for Transfer Function Classes
Allows taking laplace transform directly by using the transfer function
Coded by N.

The following Matlab project contains the source code and Matlab examples used for harmfit sinusoidal harmonic curve fitting.
This is the core formula of discrete Fourier transform: it simply computes the amplitude and phase shift of fundamental or harmonics of a phase signal.

The following Matlab project contains the source code and Matlab examples used for short time fourier transform.
This function enables computation of the short time Fourier transform (STFT) of signals.

The following Matlab project contains the source code and Matlab examples used for short time fourier transform.
STFT gives the time information along with frequency information of the signal.

The following Matlab project contains the source code and Matlab examples used for short time fourier transformation (stft) with matlab implementation.
The present code is a Matlab function that provides a Short-Time Fourier Transformation (STFT) of a given signal x(n).

The following Matlab project contains the source code and Matlab examples used for stft, short time fourier transform.
To compute STFT three windows are available in this code Rectangular, Hamming and Hanning.

The following Matlab project contains the source code and Matlab examples used for ct reconstruction package .
Set of functions performing ct reconstruction tasks like a radon transformation, a simple backprojection, a filtered backprojection using a convolution in the spatial domain, a filtered backprojection using a 2D Fourier transformation, and a filtered back projection using the central slice theorem.

The following Matlab project contains the source code and Matlab examples used for numerical inverse laplace transform.
This set of functions allows a user to numerically approximate an inverse Laplace transform for any function of "s".

The following Matlab project contains the source code and Matlab examples used for weeks' method for numerical laplace transform inversion with gpu acceleration.
The numerical inversion of the Laplace transform is a long standing problem due its implicit ill-posedness.

The following Matlab project contains the source code and Matlab examples used for fourier cosine and sine transforms using lagged convolutions in double-precision (dlagf0 and dlagf1) .
Conversions of these routines into Matlab.

The following Matlab project contains the source code and Matlab examples used for short time fourier transform (stft).
%% function [t,frequency,Power_spectrum]=fft_s(y,windowlength)
%% Inputs :
% y: input raw signal
% windowlength: window length to take fast fourier transform, it is a
% factor of smapling frequency for example one can enter a window length
% half of the sampling frequency by enteríng 0.

The following Matlab project contains the source code and Matlab examples used for radix 2 fast fourier transform decimation in time frequency.
Source code provided by Nevin Alex Jacob.

The following Matlab project contains the source code and Matlab examples used for radix2 decimation in time 1d fast fourier transform fft.
The function implement the 1D radix2 decimation in time fast Fourier transform (FFT) algorithm.

The following Matlab project contains the source code and Matlab examples used for integer order hankel transform.
This routine implements Hankel transforms of integer order based on a Fourier-Bessel series expansion.