Difference between revisions of "Fftdiff.m"
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Spectral differentiation kernel. Differentiation corresponds to multiplication in the Fourier domain. This function generates the multiplier. | Spectral differentiation kernel. Differentiation corresponds to multiplication in the Fourier domain. This function generates the multiplier. | ||
Revision as of 18:27, 5 June 2026
Spectral differentiation kernel. Differentiation corresponds to multiplication in the Fourier domain. This function generates the multiplier.
Syntax
kern=fftdiff(order,npoints,dx)
Arguments
order - order of the derivative
npoints - number of points in the grid
dx - grid step length
Outputs
kern - a vector that is to be used for accurate
numerical differentiation of periodic real
signals in the following way:
derivative=real(ifft(fft(signal).*kern));
Notes
Periodic boundary conditions.
See also
fdmat.m, fdvec.m, fourlap.m, fourdif.m
Version 2.1, authors: Ilya Kuprov
