[FieldTrip] biosemi bdf >> read_24bit error + no events found

[Paul Zerr]

Dear Robert,

it seems that defining a full path vs. only the filename (even if in
current folder) makes the difference.

filename = '/file/to/path/name.bdf' %events are found, everything ok
filename = 'name.bdf' %file is found and processed by ft_definetrials but
NO events are found

This is very odd. I don't get a "file not found" error but just "0 events".

Greetings,
Paul



> Hi Paul,
>
> I suppose it is an incompatibility between your particular BDF file and
> the code. I suggest you use MATLAB debugging facilities to check what is
> wrong in the lower-level code. See http://tinyurl.com/oy7b496.
>
> best regards,
> Robert
>
>
>
> On 25 May 2015, at 15:51, Paul Zerr <zerr.paul at googlemail.com> wrote:
>
> > I have not. I can read in the header but that's about it.
> > I don't have any older matlab versions here to test it with either.
> >
> > From what I understand ft_preprocessing should be capable of reading
> bdf's directly with only the file name as input arg.
> >
> > Greetings,
> > Paul Zerr
> >
> >
> > From: <bibi.raquel at gmail.com>
> > To: FieldTrip discussion list <fieldtrip at science.ru.nl>
> > Subject: Re: [FieldTrip] biosemi bdf >> read_24bit error + no events
> >         found
> > Message-ID: <5560dddf.0b91340a.2dab.ffffdae5 at mx.google.com>
> > Content-Type: text/plain; charset="utf-8"
> >
> > Have you resolved this issue?
> >
> >
> > From: Paul Zerr
> > Sent: ?Thursday?, ?May? ?14?, ?2015 ?8?:?01? ?AM
> > To: FieldTrip discussion list
> >
> >
> > Hi all,
> >
> > I'm new to fieldtrip so forgive me if my mistake is obvious.
> > I want to import my raw, markerless dataset (
> http://www.filedropper.com/1_20) with
> >
> > cfg = [];
> > cfg.dataset = '2.bdf';
> > data = ft_preprocessing(cfg)
> >
> > However, I get
> >
> > reading and preprocessing
> > error opening file: 2.bdf
> > One or more output arguments not assigned during call to "read_24bit".
> >
> > Error in read_biosemi_bdf>readLowLevel (line 274)
> >   buf = read_24bit(filename, offset, numwords);
> >
> > Error in read_biosemi_bdf (line 242)
> >       buf = readLowLevel(filename, offset, epochlength); % see below in
> subfunction
> >
> > Error in ft_read_data (line 321)
> >     dat = read_biosemi_bdf(filename, hdr, begsample, endsample,
> chanindx);
> >
> > Error in ft_preprocessing (line 578)
> >       dat = ft_read_data(cfg.datafile, 'header', hdr, 'begsample',
> begsample,
> >       'endsample', endsample, 'chanindx', rawindx, 'checkboundary',
> >       strcmp(cfg.continuous, 'no'), 'dataformat', cfg.dataformat)
> >
> > Error in Untitled (line 19)
> > data = ft_preprocessing(cfg)
> >
> > Using cfg.trialdef.eventtype = '?'; outputs "no events were found in the
> datafile" for ft_definetrial even for datasets with many markers.
> Converting to EDF+ did not help as it then says "channels with different
> sampling rate not supported". Specifying only one channel makes no
> difference. The file itself is fine (opens well in BvA).
> >
> > Defining only one channel to preprocess gives the same error.
> >
> > I couldn't find a solution in the archives, the faq, wiki or
> documentation.
> >
> > I'm using debian stable & matlab 2014a. Same issue at DCC computers
> running windows & matlab 2013a.
> >
> > Any ideas?
> >
> > Much appreciated,
> >
> > Paul Zerr
> > _______________________________________________
>
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