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From: Walter Roberson on 14 Jun 2010 16:49
martha wrote:

> However, I don't think I have clearly stated my aim: I want to figure
> out the number of coefficients (or datapoints embedded in the fourier
> transform) I need in order to get the ifft of that transform with a
> pre-specified error term - so that I would be able to compare various
> data points considering that measure.


If you transform back with fewer coefficients than were in the original, then
how would you calculate the MAE since there would be a mismatch in the number
of points? Unless, that is, that the smaller number of ifft()'d values were
interpolated to get the projected values, and the MAE was calculated between
the interpolated values and the actual values? If that is the case, then we
would need to know which interpolating function you planned to use.
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