[FieldTrip] ft_rejectvisual problem

[jan-mathijs schoffelen]

Hi Robert and Ozan,

I think that the problem reported is due to the fact that there was just one single trial in the input. In the drawing of the figure, the axis limits are set as [1 numtrl yax1 yax2] (or something), where in Ozan's case numtrl is 1. Matlab does not like the axis limits to be non increasing

On Jan 22, 2014, at 5:02 PM, Robert Oostenveld wrote:

> Hi Ozan
> 
> The error suggests that the variance that is computed is either 0, or is nan. A zero variance could be the cause of a channel that is clipping. The consequence of that is that the scaling of the vertical axis cannot be determined correctly.
> 
> Using the following code
> 
> data = []
> data.label = {'a'}
> data.time = {1:1000};
> data.trial = {zeros(1,1000)};
> 
> cfg = [];
> ft_rejectvisual(cfg, data)
> 
> I was able to reproduce your error. I only have a single all-zero channel (and one trial), but it suggests that your data is all zero. I suggest you check your data with ft_databrowser or standard MATLAB plotting functions.
> 
> The error of ft_rejectvisual however should not occur, so I have filed it on our bug tracking system as http://bugzilla.fcdonders.nl/show_bug.cgi?id=2450
> 
> If you want to keep track of the bug and be notified when we fix it, please register at bugzilla.fcdonders.nl and add yourself as CC to the bug.
> 
> best regards and thanks for reporting the issue,
> Robert
> 
> 
> 
> On 22 Jan 2014, at 14:07, Ozan Çağlayan wrote:
> 
>> Hi,
>> 
>> When I call ft_rejectvisual, I receive the following matlab error:
>> 
>>>> [data] = ft_rejectvisual(cfg, data)
>> the input is raw data with 14 channels and 1 trials
>> showing a summary of the data for all channels and trials
>> computing metric [--------------------------------------------------------|]
>> Error using set
>> Bad property value found.
>> Object Name: axes
>> Property Name: 'XLim'
>> Values must be increasing and non-NaN.
>> 
>> Error in axis>LocSetLimits (line 201)
>>   set(ax,...
>> 
>> Error in axis (line 93)
>>               LocSetLimits(ax(j),cur_arg);
>> 
>> Error in rejectvisual_summary>redraw (line 252)
>> abc = axis; axis([1 info.ntrl abc(3:4)]);
>> 
>> Error in rejectvisual_summary (line 126)
>>   redraw(h);
>> 
>> Error in ft_rejectvisual (line 274)
>> [chansel, trlsel, cfg] = rejectvisual_summary(cfg, tmpdata);
>> 
>> --------
>> 
>> my cfg is empty. Data is a one trial x 14 channel EEG data. The visual
>> rejection GUI appears but when I change the metric the figures in the
>> GUI are not redrawn. Is this expected? Is the above error important?
>> This is Matlab 2013a on Linux with the latest FieldTrip from GIT.
>> 
>> Thanks.
>> 
>> -- 
>> Ozan Çağlayan
>> Research Assistant
>> Galatasaray University - Computer Engineering Dept.
>> http://www.ozancaglayan.com
>> 
>> _______________________________________________
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>> fieldtrip at donders.ru.nl
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> 
> 
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Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

http://www.hettaligebrein.nl

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