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

History of AFNI updates  

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October 29, 2003 11:40PM
I have one volume with 20 slices of data. I would like to calculate the mean and standard deviation of each pixel and save it a volume dataset.
I tried implementing this following in 3dcalc. However could not implement the expression. Is there a way we could do this. Any help is appreicated.

The command i tried was
3dcalc -a test+orig -expr 'sqrt (sum( a - 14)^2 / (1500))' -prefix std

I know we cannot use sum and power 2 in the expr, but thats what I would like to implement.

Thanks
Partha
Subject Author Posted

Standard deviation

Partha Thirumala October 29, 2003 11:40PM

Re: Standard deviation

bob cox October 30, 2003 09:41AM

Re: Standard deviation

Partha Thirumala October 30, 2003 10:13AM