hey christian !
I think it's not smoothest, since I ran it without the dimensionality
estimation and it crashed the same way...
a bit of history: I had this problem a while ago, with melodic v1, and now,
I still get it with v2.0 (sorry for not reporting it before, I just forgot)
sylvain
ps: it still says "Melodic Version 2.0 BETA", in the first line of the log
files...
------------------------------------
Melodic Version 2.0 beta
Melodic results will be in .............
Reading data file filtered_func_data ... done
Create mask ... done
child killed: SIGABRT
On Wed, 16 Oct 2002 13:29:39 +0100, Christian Beckmann
<[log in to unmask]> wrote:
>Hi
>
>looks like smoothest isn't happy, can you please try
>
>/usr/local/bin/fsl/bin/smoothest -d 700 -r filtered_func_data -m
>/fsl_analysis/700vol.ica/mask
>
>In cases like yours where the number of voxels is relatively small
>compared to the number of time points you might even want to switch off
>the automatic dim. estimation - I wouldn't necessarily assume that it
>gives reliable estimates - you can do this from the GUI or usingthe -d
>option from the command line
>
>ta
>Christian
>
>
>Rombouts, S.A.R.B. wrote:
>> Dear FSL experts,
>>
>> I am trying to analyze my fMRI data using melodic:
>> Number of slices = 3
>> Matrix = 64x64
>> Number of volumes = 1024
>> TR = 0.3 sec
>>
>> The system crashes after some calculations. The strange thing is that I
>> have no problems when I only use the first 100, 200, or 500 volumes.
>> However, when I try to use melodic with 700 volumes or more, I get the
>> error:
>>
>> ######
>> Reading data file filtered_func_data ... done
>> Create mask ... done
>> Excluding voxels with constant value
>> Data size : 700 x 6064
>> Removing mean image ... done
>> Estimating data covariance ... done
>> Perform variance-normalisation ... done
>> Removing mean time course ... done
>> Starting PCA ... done
>> Estimating the number of sources from the data (PPCA) ...
>> Calling Smoothest: /usr/local/bin/fsl/bin/smoothest -d 700 -r
>> filtered_func_data -m /fsl_analysis/700vol.ica/mask >
>> /fsl_analysis/700vol.ica/smoothest
>>
>> child killed: SIGABRT
>> #####
>>
>> I am sure that the amount of memory is not a problem on the system I use
>> (RAM = 1 GB, swap = 2.5 GB) and all my volumes are ok.
>>
>> Is there possibly an upper limit to the number of volumes melodic can
>> handle?
>>
>> Thanks for any help,
>> Serge.
>>
>>
>> Serge Rombouts, PhD
>> Functional MRI Laboratory
>> Vrije Universiteit Medical Center
>> Amsterdam, The Netherlands
>> Tel. +31 20 4440316
>> Fax +31 20 4444147
>> _www.fmri.nl_
>>
>
>
>--
> Christian F. Beckmann
> Address: Oxford University Centre for Functional
> Magnetic Resonance Imaging of the Brain,
> John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
> Email: [log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann/
> Phone: +44(0)1865 222782 Fax: +44(0)1865 222717 Mob: +44(0)7811 189123
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