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
f(x,y) = sum( exp(2i*pi/px*k*x)*c(k,m)*exp(2i*pi/py*m*y),...
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)/...
( SEE Chapter 4 of 'Applied Analysis' by Cornelius Lanczos )
Howard Wilson (2022). Double Fourier Series Surface Plotting (https://www.mathworks.com/matlabcentral/fileexchange/24753-double-fourier-series-surface-plotting), MATLAB Central File Exchange. Retrieved .
MATLAB Release Compatibility
Platform CompatibilityWindows macOS Linux
Inspired: Fourier series with sigma approximation
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!