AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

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Philipp
June 30, 2022 02:31PM
Dear AFNI people (and dear Paul),

I have a question concerning the Lomb-Scargle Periodogram and its AFNI implementation, namely 3dLombScargle.

The number of bins in the frequency-domain that are created by 3dLombScargle are defined by 1/T, where T is the duration or number of sampling points of the time-series (in TRs, I assume).

Is there a way to change the number of bins, like in a standard Periodogram via adjusting the nfft value? Or is that generally not possible due to the different computation of the Lomb-Scargle Periodogram, so that the number of bins is always determined by the length of the time-series?
In case it would be principally possible, is there any chance that this feature will be implemented in 3dLombScargle in the future?

One of the reasons why I am asking this is because it would be nicer to have the exact same amount of bins when comparing runs of different lengths.

Thanks,
Philipp
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Subject Author Posted

Number of bins in 3dLombScargle

Philipp June 30, 2022 02:31PM

Re: Number of bins in 3dLombScargle

ptaylor July 05, 2022 01:22PM

Re: Number of bins in 3dLombScargle

Philipp July 06, 2022 03:39AM