Hi,
This is a LOT of data to feed into a group-level MELODIC. I suspect
that you will need to use a 64-bit machine with LOTS of RAM to run
this and/or lower the standard space resolution in the GUI.
At this point if you run MELODIC via the GUI you will need to re-run
all the preprocessing/registration steps, though if you're prepared
to look through the various log files you should be able to work out
yourself how to run the final call to the melodic binary without
having to rerun everything else.
Cheers.
On 7 Sep 2007, at 19:38, Vishwadeep Ahluwalia wrote:
> Hi,
> Ive 40 session1 datasets that i want to compare with 40 session2
> datasets
> using Group melodic. Ive the following questions:
> 1.both sessions have exactly same paradigm but i want to see if
> response in
> the 2 sessions is the same. to do this i specified the 80 datasets
> in group
> ICA and specified the appropriate time series model and group paired
> comparison model for post hoc analysis. but what kind of analysis
> should i
> use whether i should use temporal concat. or tensor ICA.
> 2. when i ran temporal concat.analysis, the individual prestats and
> registration was successful for each dataset..but there was an
> error when
> PCA starts, Data size: 3120 x 38978
> starting PCA...terminate called after throwing an instance of
> 'std:bad_alloc'
> what(): St9bad_alloc
>
> earlier i had used a smaller dataset and i didnt get this error. so
> i was
> wondering if this is another samplesize-related issue just like it
> was in
> the case of 3rd level FEAT.
> 3. Once prestats and registration is done on individual datasets
> i.e it
> creates .ica directories for each dataset, how can i re-run a group
> analysis
> without having to rerun the individual pre-stats and registration
> again.
>
> any help would be appreciated. Thanks!
> -vish
------------------------------------------------------------------------
---
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
------------------------------------------------------------------------
---
|