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INVFFT

 

Syntax: @INVFFT(R)

R = a range

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

Examples:

Matrix A1..B4 =

A B
1 0.99 0
2 3 6.2
3 4.1 1.1
4 3.3 6.3

@INVFFT(A1..B4) =
2.8475 3.4
-0.8025 -0.2
-0.3025 -2.85
-0.7525 -0.35

@INVFFT(A1..F3) = Error - @INVFFT, dimension must be power of 2


next up previous contents index
Next: IPMT Up: A Function Reference Previous: INVERT

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