Hi Steve,
thanks for your suggestions. This was my first idea as well, so I stopped
using design matrix or contrast. With or without, same result.
What I did so far for testing (all on the fsl course data;
/fsl_course_data/melodic/tensor):
1. run tensor ICA with functional runs of all four subjects -> failed
2. run tensor ICA with functional runs of two subjects -> failed
3. split functional runs of subject 1 into two parts and run tensor ICA an
these -> worked
4. split functional runs of subject 2 into two parts and run tensor ICA an
these -> worked
5. run tensor ICA on part 1 of subject 1 and part 1 of subject 2 -> worked
6. run tensor ICA on all 4 parts
(part1/subj1,part2/subj1,part1/subj2,part2/subj2) -> worked
When tensor ICA failed, then with the error given in my previous message,
which also means it does not give a full html-report (report/00index.html
does not show any components, TICA modes or PCA estimates).
Especially 6 and 2 are interesting, because it's the same data but in 6
split into pieces.
I tried it on a PC running fedora and could successfully run tica on three
subjects (again fsl course data). Including subject4 failed but without a
"segmentation fault" error and reflect probably insufficient working memory.
So it might be a debian related problem. Has anyone run a tensor ica on a
debian system?
Also, what alternatives do I have to bring single subject / single session
icas together on the group level? I know Greicius et al. (2004). Does
anyone know other papers?
Thanks for your help,
Cheers!
Sascha
fimlab.uni-hd.de
On Tue, 22 Jul 2008 09:01:52 -0700, Steve Smith <[log in to unmask]> wrote:
>Hi - I'm guessing that this means that the design matrix and/or
>contrast that you're feeding into MELODIC (if you are doing that) are
>not valid? If you could send those files we could have a look.
>
>Cheers.
>
>On 20 Jul 2008, at 07:26, Sascha Purmann wrote:
>
>> Dear FSL List:
>>
>> I am trying to run tica with melodic (Melodic Version 3.05). First
>> try on my
>> own data failed, so I tried it on the fsl course data. Again, no
>> success. I
>> tried it on different debian/ubuntu systems (e.g. ubuntu hardy,
>> amd64bit,
>> 4GB Ram) and get errors on all systems.
>>
>> I get a "segmentation fault" error messages in logs/gica:
>>
>> --snip--
>>
>> [...]
>>
>> Step no. 85 change : 0.000378202
>> Rank-1 approximation of the time courses; change : 0.013905
>> Convergence after 85 steps
>>
>> Sorting IC maps
>>
>> fdtr domain error
>>
>> [...]
>>
>> DOF cannot be zero or negative!
>>
>> stdtr domain error
>>
>> ndtri domain error
>>
>> [...]
>>
>> Segmentation fault (core dumped)
>>
>> --snap--
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