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FFT

 

Syntax: @FFT(R)

R = a range

@FFT generates the Discrete Fourier Transform of the range R using a Fast Fourier Transform algorithm. The length of the range must be a power of 2. @FFT will produce the same results a @DFT, but it is much faster ( tex2html_wrap_inline16109 time time, as opposed to tex2html_wrap_inline16111 time).

Examples:

Vector C1..C4 =

C
1 1.2
2 3.4
3 54.3
4 0.34

@FFT(C1..C4) =
59.24 0
-53.1 3.06
51.76 0
-53.1 -3.06


next up previous contents index
Next: FILEEXISTS Up: A Function Reference Previous: FALSE

NExS User's Guide, Version 1.4.5
Grey Trout Software
11 April 1999