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What are the errors in the FFT? [message #52466] Thu, 08 February 2007 08:53
monty is currently offline  monty
Messages: 2
Registered: February 2007
Junior Member
For a given function f(t) I am finding:

FFT(FFT(f(t),-1),1) -f(t) varies between about 10^-7 to 1-^-8 for
floating point
and about 10^-14 to 10^-16 for double precision

(I.e. the inverse transform of the transform deviates from the
original function)

Is this aproblem with the IDL implementation of the FFT, or is this a
more fundamental issue with the algorithm itself?

-Monty Wood

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