[FieldTrip] ft_preprocessing error message during reading some files

[Beom Jun Min]

Dear Julian Keil,

Thank you for your reply.
I agree with that your problem was similar with mine.
My data was acquired by Neuroscan also.
There might a problem associated with .CNT file in the newer version.

Could you tell me the number of the older version you used?

Best Regards



2013/5/29 Julian Keil <julian.keil at gmail.com>

> 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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-- 
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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