Thank you Burkhard and Danny.
It's unfortunate that it cannot be done. Is there a reason for it,
based on how the algorithms are implemented?
Also, correct me if I am wrong, but the previous command I was using
(maxfilter -f $file -frame head -origin 0 0 40 -trans default)
realigned all files to the same origin as well. What would be the
advantages of realigning it to the first file?
Best,
Gus
On Aug 26, 2008, at 10:19 AM, Danny Mitchell wrote:
> Hi Gustavo,
>
> I think the answer to question 1 is no: transformation of the data
> requires SSS. The command you would want for aligning two sessions
> would be something like:
> maxfilter -f $session2.fif -trans session1.fif
> (-nosss was designed for testing and is not recommended...)
>
> Not sure about the answer to question 2...
>
> Danny
>
> 2008/8/26 Gustavo Sudre <[log in to unmask]>
> Hello,
>
> I have a couple questions about Maxfilter:
>
> 1) Is there a way to move my data from different sessions (same
> subject) to the same coordinate system without using the SSS
> algorithm? I saw the -nosss option in the manual, but it was unclear
> on exactly what it does. I currently use something like maxfilter -f
> $file -frame head -origin 0 0 40 -trans default , for running it
> with SSS. The goal is to treat the data as if they came from only
> one session, with the fewer modifications to it as possible.
>
> 2) After running Maxfilter (with SSS), my files increase size by a
> factor of 3x. What kind of information is stored in the FIFF files
> now that they are so big? Is it just a matter of the precision that
> the data is now stored?
>
> Thanks,
>
> Gus
>
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