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
September 06, 2021 02:43AM
An update:

I managed to display the output of step 2 (the calculated frequency domain) by adding the command "> Avg_FFT.1D".
Next, I could then easily display the .1D file via the command "1dplot -ok_1D_text avg_fft.1d". AFNI then plots the frequency domain and it is way better to inspect than via the AFNI GUI of course.

However, I am still stuck with the calculation of the power law exponent (PLE, step 3) based on the previously calculated frequency domain. I also searched through the board here as well as through AFNI’s program list, tried out lots of things, but I am still unable to do this.

In case you could provide help I would be thankful.

Philipp
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Subject Author Posted

Fast Fourier Transform (FFT) – Displaying the frequency-domain

Philipp September 04, 2021 02:20PM

Re: Fast Fourier Transform (FFT) – Displaying the frequency-domain

Philipp September 06, 2021 02:43AM

Re: Fast Fourier Transform (FFT) – Displaying the frequency-domain

Philipp September 06, 2021 01:04PM

Re: Fast Fourier Transform (FFT) – Displaying the frequency-domain

Daniel Glen September 07, 2021 11:08AM

Re: Fast Fourier Transform (FFT) – Displaying the frequency-domain

Philipp September 08, 2021 04:42AM