Check out the discussion here

http://physics.nyu.edu/grierlab/idl_html_help/signal8.html

--- In ultimaserial_group@yahoogroups.com, "wolbie76" <curtis@...> wrote:
>
> Thank you for the response,
>
> Do you know the equations for use with the GetRe and GetIm to yield
> phase?
>
> I am still trying to learn FFT so that I can use the control to get my
> result, any help with how the GetPowerPt result is scaled would also be
> appreciated.
>
> Thanks.
>