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
August 01, 2016 04:51PM
OK, I think I've found the issue: there was a variable in 3dRSFC initialized to be "frequency greater than Nyquist" in order to provide an upper limit of the "full band" denominator in the fALFF calculation. This number was very big, so dividing by such a small df (=1/(TR * Nt), where Nt was very large in this time series), produced a numerical error. I've set the initialized frequency to be smaller, but still greater than Nyquist, so this problem won't occur.

I've push in the changes, so in the next update, this problem should be solved. Let me know if there are further issues with it.

--pt

ps: that's a really long duration time series-- what patient subjects you must have!
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Subject Author Posted

3dRSFC

Ali_Ghazizadeh July 29, 2016 05:35PM

Re: 3dRSFC

ptaylor August 01, 2016 04:51PM

Re: 3dRSFC

ptaylor August 02, 2016 11:36AM