MagicPlot Manual

Plotting and nonlinear fitting software

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Table of Contents

Fast Fourier Transform (FFT)

Open table with initial data and use Analysis → Fast Fourier Transform menu item to perform FFT.


MagicPlot uses 'electrical engineering' convention to set the sign of the exponential phase factor of FFT. 1)

Here c_n is signal components and C_n spectrum components, n = 1…N.

Check Box
Forward Transform Inverse Transform
Unchecked C_n = sum{k=1}{N}{c_k e^{−2 pi i k n {/} N}} c_n = 1/N sum{k=1}{N}{C_k e^{2 pi i k n {/} N}}
Checked C_n = 1/N sum{k=1}{N}{c_k e^{−2 pi i k n {/} N}} c_n = sum{k=1}{N}{C_k e^{2 pi i k n {/} N}}
Most scientific applications uses the same sign conventions. But note, that the sign of exponential phase factor in Numerical Receipts in C, 2nd edition, p. 503 is the opposite
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fft.1272229095.txt.gz · Last modified: Sun Nov 8 12:20:32 2015 (external edit)