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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ptaylor
July 04, 2018 02:33PM
Bob has now updated the program so you can specify the number of points to match; by default, it will still zeropad up to a "fast" number as before.

In your case with 112 points in the time series, running: 
3dDFT -prefix AAA FILE
... would give you an FFT zeropadded to N=120 points.

Now, with the newest version of AFNI, you could run the following: 
3dDFT -nfft 112 -prefix BBB FILE
... and that will process (more slowly) with 112 points.

The latter should land you on your frequency more directly, if that's what you want.

Re. the phase calculation:
Ah, I didn't see that you had included "-cx2r PHASE" in your 3dcalc command, OK. Sorry for my confusion.

--pt
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Subject Author Posted

3dDFT question

Hyuntaek June 19, 2018 04:07PM

Re: 3dDFT question

ptaylor June 20, 2018 08:15AM

Re: 3dDFT question

Hyuntaek June 20, 2018 11:06AM

Re: 3dDFT question

ptaylor June 21, 2018 07:29AM

Re: 3dDFT question

Hyuntaek June 21, 2018 05:27PM

Re: 3dDFT question

ptaylor July 04, 2018 02:33PM

Re: 3dDFT question

Hyuntaek July 05, 2018 03:13PM