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[ferret_users] Reg: period calculation in FFT

Dear ferreters,

Please help me and thanks in advance.

I have a query regarding defining period  in FFT. The example below is for monthly navy winds in ferret.
! Define the period from the frequency axis. (From FFT demo)
      LET per = 1./a

Here 1./a for monthly data (If I am correct). If I have hourly data, what should the the value in place of 1.

And also if it is weekly and 15 days data what should be taken. I have both hourly data and 15 days data. I am confused in taking this value. 

Please help.
Thank you.

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