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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Zhihao_Li
January 15, 2017 09:01AM
Hi AFNI experts,
I am not quite sure how the "maximum pairwise displacement" is calculated in "1d_tool.py", please see if my understanding is correct. Suppose we have only 3 time points and the 6 head motion parameters at each time points are (a1, b1, c1, d1, e1, f1), (a2, b2, c2, d2, e2, f2), (a3, b3, c3, d3, e3, f3). So the "maximum pairwise displacement" is calculated as this:

max( abs(a1-a2), abs(a1-a3), abs(a2-a3), abs(b1-b2), abs(b1-b3), abs(b2-b3), ..., abs(f1-f2), abs(f1-f3), abs(f2-f3) )

Am I correct? Thank you so much!
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maximum pairwise displacement

Zhihao_Li January 15, 2017 09:01AM

Re: maximum pairwise displacement

rick reynolds January 17, 2017 10:33AM