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.
Yep, that's normal. See, for example, from pg 32 onward here describing more about the *.grid files:
[afni.nimh.nih.gov]
But, all the targets in a network are not necessarily connected directly to all other targets (that is the case biologically, and also for tracking, possible for related or different reasons); in general (and esp. for larger networks), that is not the case, and the "zeros" in the NT matrix (and also appearing in others) show where tracts were not found.