[FieldTrip] ft_preprocessing error message during reading some files

[Julian Keil]

Dear BJ Min,

what type of data are you trying to read in?
I had similar problems when reading in .CNT data.
Also, with some systems you have to specify the bit rate (e.g. Neuroscan).
For me, reading in data with an older version of FieldTrip solved the problem, but this was in 2011, so I cannot say if the problem with .CNT files has been solved.

Good Luck

Julian

********************
Dr. Julian Keil

AG Multisensorische Integration
Psychiatrische Universitätsklinik
der Charité im St. Hedwig-Krankenhaus
Große Hamburger Straße 5-11, Raum E 307
10115 Berlin

Telefon: +49-30-2311-1879
Fax:        +49-30-2311-2209 
http://psy-ccm.charite.de/forschung/bildgebung/ag_multisensorische_integration

Am 29.05.2013 um 11:47 schrieb Beom Jun Min:

> Dear all,
> 
> Hello, my name is BJ Min from Korea.
> 
> I'm dealing with EEG data of many subjects. 
> 
> When I run ft_preprocessing, the error message below shows with only some files of my data. (not all files)
> 
> Warning: rounding "endsample" to the nearest integer 
> > In ft_read_data at 100
>   In ft_preprocessing at 577
> ??? Error using ==> ft_read_data at 149
> cannot read data after the end of the file
> 
> Error in ==> ft_preprocessing at 577
>       dat = ft_read_data(cfg.datafile, 'header', hdr, 'begsample', begsample, 'endsample', endsample, 'chanindx', rawindx,
>       'checkboundary', strcmp(cfg.continuous, 'no'), 'dataformat', cfg.dataformat) 
> 
> I think that there might be a kind of problem in data acquisition, and I modified below scripts in the ft_read_data function with comment %.
> 
> % % test whether the requested data segment is not outside the file
> % if any(begsample<1)
> %   error('FILEIO:InvalidBegSample', 'cannot read data before the begin of the file');
> % elseif any(endsample>(hdr.nSamples*hdr.nTrials))
> %   error('FILEIO:InvalidEndSample', 'cannot read data after the end of the file');
> % end
> 
> After that, the ft_preprocessing worked well.
> 
> However, the files with the first problem showed additional warning message while running ft_definetrial. (not error message)
> 
> Warning: Integer operands are required for colon operator when used as index 
> > In fileio\private\loadcnt at 464
>   In ft_read_header at 1450
>   In ft_preprocessing at 398
> 
> Warning: rounding "endsample" to the nearest integer 
> > In ft_read_data at 100
>   In ft_preprocessing at 577
> 
> Also, during ft_redefinetrial, following warning message occurs.(not error message)
> 
> Warning: removing inconsistent sampleinfo 
> > In ft_datatype_raw at 97
>   In ft_checkdata at 213
>   In ft_redefinetrial at 104
> 
> Warning: the trial definition in the configuration is inconsistent with the actual data 
> > In utilities\private\warning_once at 116
>   In utilities\private\fixsampleinfo at 74
>   In ft_datatype_raw at 154
>   In ft_checkdata at 213
>   In ft_redefinetrial at 206
> 
> Warning: reconstructing sampleinfo by assuming that the trials are consecutive segments of a continuous recording 
> > In utilities\private\warning_once at 116
>   In utilities\private\fixsampleinfo at 79
>   In ft_datatype_raw at 154
>   In ft_checkdata at 213
>   In ft_redefinetrial at 206
> 
> I wonder if these messages during ft_redefinetrial mean wrong defining trials. 
> Should I continue these process like this, modifying the ft_preprocessing function? 
> Or, is it better to exclude some erroneous files?
> 
> Best regards
> 
> -- 
> BeomJun Min, M.D.
> 
> Department of Medical System Engineering (DMSE)
> Gwangju Institute of Science and Technology (GIST) 
> 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju 
> 500-712, Republic of Korea (South) 
> Phone: +82-62-715-3266 / Fax: +82-62-715-3244 
> E-mail: mbj0310 at gmail.com, http://bmssa.gist.ac.kr
> _______________________________________________
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