Hi - if you are trying to temporally concatenate many sessions/
subjects worth of 4D datasets, this can indeed be high-RAM. Your two
main choices are to increase RAM/SWAP, or resample the data to lower
spatial resolution first.
Cheers.
On 17 Jun 2008, at 10:06, Jack Grinband wrote:
> Hi All,
> So, I tried a bunch of different things to get all my runs
> concatenated but
> I just can't get it to work. The amount of time it takes to load a
> file
> using fslmerge is exponentially related to its size (or at least
> that's the
> case on my computer with 3G of RAM).
>
> I've tried:
> 1. fslmerge -t out file1 file2 ... file68 crashes.
> 2. Serially appending in matlab which results in matlab crashing...
> I think
> it runs out of memory
> 3. fslmerging a small group of runs (which is really fast) and then
> trying
> to merge those groups is impossibly slow.
>
> Does anyone have any ideas about how to concatenate my data? I'm
> guessing
> that melodic doesn't concatenate first and do ica on the
> concatenated file,
> but rather does ica on individual files and concatenates the
> results... is
> this right? I couldn't figure it out from the log file.
> thanks,
>
> jack
>
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Stephen M. Smith, Professor of Biomedical Engineering
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