# Double Fourier Series Surface Plotting (Scripts) 1.0

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• Last update: 6 years ago
• Price: Free |
• Operating system: Linux, Mac OS X, Win All, BSD, Solaris
• Publisher: Howard Wilson (7 other programs)
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## Double Fourier Series Surface Plotting (Scripts) Publisher's description

### Program FFT2SURF plots double Fourier series representations for several different surfaces

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 approximate form:

f(x,y) = sum( exp(2i*pi/px*k*x)*c(k,m)*exp(2i*pi/py*m*y),...
k=-n:n, m=-n:n)

If the function has discontinuities, a better approximation
can sometimes be produced by using a smoothed function fa(x,y)
obtained by local averaging of f(x,y) as follows:

fa(x,y) = integral(f(x+u,y+v)*du*dv, -s<u<+s, -s<v<+s )/(4*s^2)

where s is a small fraction of min(px,py). Wherever f(x,y) is
smooth, f and fa will agree closely, but sharp edges of f(x,y)
get rounded off in the averaged function fa(x,y). The Fourier
coefficients ca(k,m) for the averaged function are simply
ca(k,m) = c(k,m)*sig(k,m) where the sigma factors sig(k,m) are
sig(k,m) = sin(sin(2*pi*s*k/px)*sin(2*pi*s*m/py)/...
((2*pi*s*k/px)*(2*pi*s*m/py))
( SEE Chapter 4 of 'Applied Analysis' by Cornelius Lanczos )

#### System Requirements:

MATLAB 7.5 (R2007b)
Program Release Status: Major Update
Program Install Support: Install and Uninstall

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