Hi Steve,
thanks for the reminder about the fslmaths command. I was just about
to browse the mail archives for that :-)
RAM shouldn't be an issue. I ran larger analyses than that on my
machine (8GB of RAM on a 64bit Linux with lots of swap).
Best regards and thanks again,
Cornelius
On Thu, Oct 13, 2011 at 11:28 AM, Stephen Smith <[log in to unmask]> wrote:
> Hi - actually I wasn't quite right - the rank of the multiple regression
> would only be an issue in stage 2……. but yes it's worth checking that all
> images have the same dimensions.
> So I think you must have a problem with either the group maps, or the data,
> or maybe your computer (RAM?), given that the regression step itself is so
> simple….
> fslmaths with -nanm lets you check for nans in the NIFTIs.
> Cheers.
>
> On 13 Oct 2011, at 10:24, Cornelius Werner wrote:
>
> Hi Steve,
>
> 1) I'll have a look at that (shouldn't be the case).
> 2) I have 72 maps for 16 subjects with 170 EPIs each - I ran similar
> analyses before (not on this particular dataset, however) without
> problems...
>
> I'll keep you posted about my progress. Thanks a million,
> Cornelius
>
> On Thu, Oct 13, 2011 at 7:39 AM, Stephen Smith <[log in to unmask]> wrote:
>
> Hi - did your input data have nans in it? Did you have more group maps
>
> than timepoints?
>
> Cheers.
>
>
> On 12 Oct 2011, at 22:03, Cornelius Werner wrote:
>
> Hi experts,
>
> I just encountered a strange error: dual regression failed already in
>
> the first stage, yielding only lots of "-nan"s in the stage1 files. I
>
> am somewhat at a loss: I checked all paths and files, everything seems
>
> ok. What could be a reason for such an error?
>
> Thanks in advance,
>
> Cornelius
>
> --
>
> Dr. med. Cornelius J. Werner
>
> Department of Neurology
>
> RWTH Aachen University
>
> Pauwelsstr. 30
>
> 52074 Aachen
>
> Germany
>
>
>
> ---------------------------------------------------------------------------
>
> 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
>
> ---------------------------------------------------------------------------
>
>
>
>
>
>
>
> --
> Dr. med. Cornelius J. Werner
> Department of Neurology
> RWTH Aachen University
> Pauwelsstr. 30
> 52074 Aachen
> Germany
>
>
>
> ---------------------------------------------------------------------------
> 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
> ---------------------------------------------------------------------------
>
>
>
>
--
Dr. med. Cornelius J. Werner
Department of Neurology
RWTH Aachen University
Pauwelsstr. 30
52074 Aachen
Germany
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