[FieldTrip] FFT on EMG data

[jan-mathijs schoffelen]

Hi Holly,

What version of fieldtrip are you using?

Best

Jan-M

On Apr 20, 2011, at 12:48 PM, Holly Rossiter wrote:

> Hi,
>
> I am trying to run an FFT on some EMG data to obtain the peak  
> frequency. This is the script I am using...
>
> D= spm_eeg_load;
> emg = D.ftraw(0);
>
> cfg=[];
>
>        cfg.method='mtmfft';
>        cfg.output='pow';
>        cfg.taper='hanning';
>        cfg.channel={'Lforearm'};
>        cfg.foi= [5 80];% frequency band - foilim or just foi??
>        freq=ft_freqanalysis(cfg,emg);
>
>      figure
> semilogy(freq.freq, freq.powspctrm(1,:), 'b-');
>
> However, I keep getting this error...
>
> processing trial 1, ??? Undefined function or variable "dum".
>
> Error in ==> ft_freqanalysis_mtmfft at 345
>       fprintf('nfft: %d samples, taper length: %d samples, %d
>       tapers\n',length(dum),size(tap,2),numtap);
>
> Error in ==> ft_freqanalysis at 111
>   [freq] =
>   feval(sprintf('ft_freqanalysis_%s',lower(cfg.method)), cfg,
>   data);
>
> Do you know how to fix this error?
>
> Thanks,
>
> Holly
>
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> fieldtrip at donders.ru.nl
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Dr. J.M. (Jan-Mathijs) Schoffelen
Donders Institute for Brain, Cognition and Behaviour,
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands
J.Schoffelen at donders.ru.nl
Telephone: 0031-24-3614793

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