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Sincerely, AFNI HQ
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
| March 30, 2022 02:55AM | |
Hello,
I'm reading the notes of 3dFWHMx, which says
'If you don't want to go to that much trouble, use '-detrend' to approximately subtract out the anatomical spatial structure, OR use the output of 3dDetrend for the same purpose.'
I tried both option on my dataset. First I using 3dDetrend -polort 2 -prefix det dset, and using the output as input for 3dFWHMx. The programs ran successfully. But then I tried using detrend option directly, i.e., 3dFWHMx -detrend 2 -mask aaa -acf bbb -input dset. The program failed the model fitting and showed a list of calfun error.
The output plots are also quite different. I paste their google drivelink as follows, if you are interested, please take a look.
So, my question is the value following -detrend in 3dFWHMx and that following -polort 2 in 3dDetrend a different parameter? If so, what's the difference and is there any explanation for the shape of the plot from 3dFWHMx -detrend 2?
Best regard,
Zixun
I'm reading the notes of 3dFWHMx, which says
'If you don't want to go to that much trouble, use '-detrend' to approximately subtract out the anatomical spatial structure, OR use the output of 3dDetrend for the same purpose.'
I tried both option on my dataset. First I using 3dDetrend -polort 2 -prefix det dset, and using the output as input for 3dFWHMx. The programs ran successfully. But then I tried using detrend option directly, i.e., 3dFWHMx -detrend 2 -mask aaa -acf bbb -input dset. The program failed the model fitting and showed a list of calfun error.
The output plots are also quite different. I paste their google drivelink as follows, if you are interested, please take a look.
So, my question is the value following -detrend in 3dFWHMx and that following -polort 2 in 3dDetrend a different parameter? If so, what's the difference and is there any explanation for the shape of the plot from 3dFWHMx -detrend 2?
Best regard,
Zixun
| Subject | Author | Posted |
|---|---|---|
|
Zixun | March 30, 2022 02:55AM |
|
ptaylor | April 06, 2022 09:56PM |
|
Zixun | May 06, 2022 07:23AM |
|
ptaylor | May 10, 2022 10:41AM |
