Dear Griselda,
>Dear Jesper, Eric & Mike,
>
>> Could you give a more detailed description of how you enter the model,
>and the full error message.
>
>This is the design I entered:
>
> PET/SPECT Models
> Single-Subject: covariates only
> I select 16 scans
> # Covariates: 1
> [16] covariate: [ 38 32 38 29 31 26 32 34 32 46 28 35 35 34 34 40]
> covariate: centre? *around overall mean
> nuisance variables: 0
> Global Normalisation: Proportional Scaling
> PropSca global mean to 50
> Threshold masking: proportional
> Analysis threshold (proportional of global) : 0.8
> Global calculation: *mean voxel value (within per image fullmean/8
>mask)
>
>The “segmentation fault” happens when I try to visualize thre process
>results:
>
> Results
> Mask with other contrast(s): no
> Title for comparison:
> Corrected height threshold: no
> Threshold {T or p value} 0.001
> & extent threshold {voxels} 20
>
>At this point SPM halts and this is the prompt message:
>
>/ __)( _ \( \/ )
>\__ \ )___/ ) ( Statistical Parametric Mapping
>(___/(__) (_/\/\_) SPM99 - http://www.fil.ion.ucl.ac.uk/spm
>
>
>
>Initialising SPM.........done
>
>SPM present working directory:
>
>/home1/DepPsicSPECT/DepPsicSPECT99/results99/pts/PtsHAM17+=26...HAM17_D
>>>
>SPM99: spm_spm_ui (v2.33) 17:49:52 - 08/02/2000
>
>========================================================================
>
>SPM99: spm_spm_ui (v2.33) 17:51:28 - 08/02/2000
>
>========================================================================
>
>Mapping files : ...done
>
>Calculating globals : ...done
>
>Design configuration : ...done
>
>Saving SPMstats configuration : ...SPMcfg.mat saved
>
>Design reporting : ...done
>
>Completed : 17:53:52 - 08/02/2000
>
>SPM99: spm_spm (v2.37) 17:54:49 - 08/02/2000
>
>========================================================================
>
>Initialising design space : ...done
>
>Output images : ...initialised
>
>Plane 68/68 , plank 1/1 : ...done
>
>Design parameters : ...done
>
>Saving results : ...done
>
>Completed : 17:58:31 - 08/02/2000
>
>...use the results section for assessment
>
>
>
>??? Error while evaluating uicontrol Callback.
>
>??? Error using ==> spm_input_ui
>Input window cleared whilst waiting for response: Bailing out!
>
>Error in ==> /home2/spm99/spm_input.m
>On line 65 ==> [varargout{:}] =
>spm_input_ui(varargin{:});
>
>Error in ==> /home2/spm99/spm_spm_ui.m
>On line 849 ==> c = spm_input(str,GUIpos,'r',[],[nScan,Inf]);
>
>
>SPM99: spm_results_ui (v2.31) 18:01:52 - 08/02/2000
>
>========================================================================
>
> SPM99: spm_getSPM (v2.35) 18:01:53 - 08/02/2000
>
> ----------------------------------------------------------------
>
> contrast image 2 : ...written con_0002.img
>
> spm{T} image 2 : ...written spmT_0002.img
>
> SPM computation : ...done
>
> contrast structure : ...saved to xCon.mat
>
>Segmentation Fault (core dumped)
>
>
it is always tricky to figure out what causes a segmentation fault when not
being able to reproduce the problem onself
>From your printouts it seeems as though it crashes in spm_getSPM.m. Could I
ask you if it crashes before or after you have been asked asked for
threshold levels.
>
>I also tried with a bigger group size (30) and had the “segmentation
>fault” message too.
>
This seems to be a software problem and is unlikely to change with group size.
>I have no problems with “Multisubject: covariates only” in SPM96
>(Proportional Scaling/ No Grand Mean Scaling/ Gray Matter threshold:
>0.8)
I must say this surprises me somewhat. It shouldn't be possible to analyse
that way with only on scan per subject since, as Eric pointed out, the
subject effects are completely confounded with your covariate. Perhaps you
could send me a .PS file depicting your design matrix.
>
>Many thanks. Griselda
>
>
Sorry I couldn't be of more assistance Jesper
Jesper Andersson
Wellcome Dept. of Cognitive Neurology
12 Queen Square
London WC1N 3BG
phone: 44 171 833 7484
fax: 44 171 813 1420
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