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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December 04, 2022 12:36PM
Hello,

I have a 3D volume with minimal value of non-zero voxels being 3.69779e-32.
When I run
3dBrickStat -min -non-zero myvolume.nii.gz
I obtain 0 as minimal value. Same if I run:
3dBrickStat -min -positive myvolume.nii.gz

Interestingly, if I binarize my volume first (any non-zero voxel changed to 1), and then use this new binary volume as a mask:
3dBrickStat -min -positive -mask myvolume_binarized.nii.gz myvolume.nii.gz
then I obtain the expected minimal value of 3.69779e-32.

Do you know why this happens? Is there a way to obtain the minimal value without having to create a binary mask?

Thanks,
Giuseppe



Edited 1 time(s). Last edit at 12/04/2022 01:08PM by gbarisano.
Subject Author Posted

3dBrickStat -non-zero / -positive

gbarisano December 04, 2022 12:36PM

Re: 3dBrickStat -non-zero / -positive

ptaylor December 04, 2022 01:24PM

Re: 3dBrickStat -non-zero / -positive

gbarisano December 05, 2022 01:34PM

Re: 3dBrickStat -non-zero / -positive

ptaylor December 05, 2022 02:08PM

Re: 3dBrickStat -non-zero / -positive

ptaylor December 05, 2022 02:39PM

Re: 3dBrickStat -non-zero / -positive

gbarisano December 05, 2022 03:02PM