Fourier Approximation

It tries to approximate a f(x) function with a m term Fourier series, using the quad MATLaB function. Requirements: - MATLAB 7.1.0 or higher Platforms: Windows, Mac, *nix, Matlab, BSD Solaris

1) plot_chain_code(ai, color, line_width)This function will plot the given chain code. The chain code (ai) should be incolumn vector.Example:>> ai = [5 4 1 2 3 4 3 0 0 1 0 1 0 0 0 7 7 1 1 0 7 5 4 5 4 5 0 6 5 4 1 3 4 4 4 4 6];>> plot_chain_code(ai)2) plot_fourier_approx(ai, n, m, normalized,... Platforms: Matlab

FindGraph is a comprehensive graphing, curve fitting, and digitizing tool. FindGraph offers 12 generic fits, including linear regression, logistic functions, fourier approximation, rationals, neural networks, B-splines and parametric curves least squares approximations, plus a library of over 300... Platforms: Windows

Displays graphs of algebraic functions in a variety of forms. These include polar and cartesian co-ordinates, parametric and intrinsic functions. A wide range of functions are built-in, from simple trig and hyperbolic functions to things such as the ceil and gamma functions. On-screen HTML help... Platforms: Windows

This function allows one to calculate the Fourier transform of a chirped function evaluated at specific points using the stationary phase approximation.Imagine a pulse with a large time-bandwidth produce: this would require a large amount of data points in order to evaluate the Fourier transform.... Platforms: Matlab

Program FFTSIGMA plots Fourier series representations with sigma approximation. The figures show effects of the number of series terms and use of Lanczos sigma factors to smooth Gibbs oscillations. The Fourier series of a periodic function with period px has the approximate form: f(x) = sum(... Platforms: Matlab

Partial sums of Fourier terms for a function with jumps in value or derivative converge poorly, because of the Gibbs phenomenon. This file uses the Fourier coefficients, and locations of the singularities, to construct a different approximation that converges spectrally. For details, see T. A.... Platforms: Matlab

Fourier Transform Lab Student Edition is an advanced application designed for performing Fourier transformations, which can be useful in teaching Crystallography, since they are related to Optical Transforms (e.g. laser diffraction patterns). Furthermore one may get a quick hands-on experience... Platforms: Windows

Finding the Fourier transform of a rectangular pulse..filtering the spectrum and regenerating the signal usingthe filtered spectrum is done...at the end Rayleigh theorem is proved by showing that the energy content of both time domain and frequency domain signals are equal..your comments are... Platforms: Matlab

According to shannon theory it is possible to reconstruct a band limited signal from its Fourier components provided it is sampled sufficiently...just to demonstrate this, posting a small example based on that Platforms: Matlab

These are two M-files d-deDUfourier1d-deDt and d-deDUfourier2d-deDt 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. It demonstrates how increasing... Platforms: Matlab

The Fourier Calculator (Simulink model) can be used for arbitrary signals. In this case the Wolfer sun spot data are analyzed Platforms: Matlab

With this Fourier Calculator a periodic signal can be analyzed and represented in figures with harmonics.The signals can easily be produced in the model. Platforms: Matlab

This program is open source code of fast Fourier transform in matlab.Where y is the input argument and p is the normalized size of the input. Lety = [1 2 3 4 ];x= length(y);m= log2(x);p= ceil(m);To call the function useft2(y,p); Platforms: Matlab

This code computes the approximation of the convolution integral (*) between two functions, f(t) and g(t), sampled at the times t1,t2,...,tm (unit spacing), via the trapezoidal quadrature rule. To compute the integral with other than unit spacing, multiply the result by the spacing... Platforms: Matlab

Program FFT2SURF plots double Fourier series representations for several different surfaces. The figures show effects of the number of series terms and use of Lanczos sigma factors to smooth Gibbs oscillations. The Fourier series of a doubly periodic function with periods px and py has the... Platforms: Matlab

FSSF2 fit a 2-D fourier series surface over scattered 3D data. Series formulation may be altered optimization fit also available. The gui is pretty self-explanatory. Enjoy! Platforms: Matlab

Provides a graphical user interface for the forward and reverse Fourier Shape Descriptor routines in Matlab Central File ID12746. Menu entries are provided for loading and saving x,y data in TAB-seperated text format and for saving and loading shape spectra in the same format. If multiple input... Platforms: Matlab

It tries to approximate a f(x) function with a m term Fourier series, using the quad MATLaB function. Platforms: Matlab

The Fourier sine series model displays the sine series expansion coefficients of an arbitrary function on the interval Platforms: Mac