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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Emperor Zhark
December 14, 2015 01:03PM
How are you looking at the datasets? The default application of 3dDFT is to produce complex-valued datasets. If you use AFNI to view the results, AFNI will show the magnitude of the complex dataset by default -- if you want to see the real part, you have to switch to that viewing mode. Given the .niml.dset suffix you are using, I suspect you are using SUMA to view the results. I'm not sure of how SUMA treats complex-valued data, or even if it CAN deal with such data properly.

For what it's worth, I just tried 3dDFT and then 3dDFT -inverse on a normal 3D+time dataset and the output real part is the same as the input to about 6 decimal places. The imaginary part of the output is in the 1e-7 range.
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Subject Author Posted

3dDFT question

felix December 12, 2015 11:23PM

Re: 3dDFT question

Emperor Zhark December 14, 2015 01:03PM

Re: 3dDFT question

felix December 14, 2015 02:01PM

Re: 3dDFT question

felix December 14, 2015 02:14PM