[FieldTrip] Errors with downsampling and artifact rejection

[Stephen Whitmarsh]

Dear Gaëlle,

To understand the problem it would be helpful to have 1) description of the
data structures going in ft_resampledata (just type in command line and
copy-paste the output) and the artefact detection function you are using,
and 2) the configuration (cfg) you are using for those functions.

Cheers,
Stephen


Op vr 19 jun. 2020 om 14:56 schreef Gaëlle Leys <gaelle.leys at kuleuven.be>:

> Dear Fieldtrip community,
>
>
>
> I have recently started with Fieldtrip for my EEG data processing and I am
> encountering some problems which I can’t seem to resolve.
>
> I’m working with mff files from an EGI EEG system. I have no problem
> reading in and preprocessing the data. However, when trying to downsample
> and setup the automatic artifact removal, I’m getting some errors.
>
>
>
> 1)      When trying to downsample with the default options, these are the
> errors that I get:
>
> Error using resample>getSamples (line 357)
>
> The number of elements of Tx must match the number of rows of X when X is
> a matrix
>
>
>
> Error in resample>nonUniformResample (line 123)
>
> [x, tx] = getSamples(varargin{1:2});
>
>
>
> Error in resample (line 116)
>
>   [varargout{1:max(1,nargout)}] = nonUniformResample(method,varargin{:});
>
>
>
> Error in ft_resampledata (line 228)
>
>         newdat = transpose(resample(transpose(olddat),fsres,fsorig));
>
>
>
>                 I have tried downsampling before filtering, after
> filtering, on continuous data, or already segmented data. None of these
> things seem to resolve the error.
>
>
>
> 2)      When trying to set up the automatic artifact removal process and
> choosing yes for the interactive plot, I get a plotting error:
>
> Error using plot
>
> Vectors must be the same length.
>
>
>
> Error in ft_artifact_zvalue>redraw_cb (line 973)
>
>     plot(opt.h1, xval, yval, 'linestyle', '-', 'color', 'b',
> 'displayname', 'data');
>
>
>
> Error in ft_artifact_zvalue (line 512)
>
>   redraw_cb(h);
>
>
>
>         I’ve noticed that the xval and yval are different numbers, which
> of course doesn’t allow plotting. It seems like the xval changes according
> to the epoch length, however the yval remains the same and equals the
> amount of samples in my continuous data.
>
>
>
> 3)      When choosing no for the interactive plot, I also get an error:
>
> Error using zeros
>
> Size inputs must be integers.
>
>
>
> Error in ft_artifact_zvalue (line 568)
>
> dum = zeros(1,max(opt.trl(:,2)));
>
>
>
> I’ve been looking into the functions and where it goes wrong, but I can’t
> seem to pinpoint what exactly is causing these issues. Anyone here that can
> help or provide me some tips?
>
>
>
> Thanks in advance!
>
>
>
> Kind regards,
>
>
>
> Gaëlle Leys
>
>
>
> Research Associate
> Brain & Cognition
> Tiensestraat 102 box 3714
> 3000 Leuven
>
> Room PSI 02.33
> tel. +32 16 37 61 98
>
>
> _______________________________________________
> fieldtrip mailing list
> https://mailman.science.ru.nl/mailman/listinfo/fieldtrip
> https://doi.org/10.1371/journal.pcbi.1002202
>
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