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<div>Hello fieldtrippers,</div>
<div>first of all, thanks a lot for this collaborative mailing list. It helped me a lot in the past and i hope you will be able to help me today !</div>
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<div>I succesfully implemented the spectral granger causality thanks to this FieldTrip tutorial : <a href="http://www.fieldtriptoolbox.org/tutorial/connectivityextended">http://www.fieldtriptoolbox.org/tutorial/connectivityextended</a>. Now I'd like to compute a Time-Frequency Map of my granger causality. Hence, I used ft_freqanalysis with cfg.method = 'mtmconvol' and cfg.output = 'powandcsd' and the minimal code</div>
<div>>cfg=[];<br />>cfg.method='granger';<br />>granger=ft_connectivityanalysis(cfg, freq); </div>
<div>to compute the granger causality.</div>
<div>However, when I run this code, Matlab bugs and stays "busy" for a while until I terminate it, with the following error message :</div>
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<div>Operation terminated by user during ft_checkdata>fixcsd (line 1255)<br /><br />In ft_checkdata (line 797)<br /> data = fixcsd(data, cmbrepresentation, channelcmb);<br /><br />In ft_checkdata>fixcsd (line 1351)<br /> data = ft_checkdata(data, 'cmbrepresentation', 'full');<br /><br />In ft_checkdata (line 797)<br /> data = fixcsd(data, cmbrepresentation, channelcmb);<br /><br />In ft_connectivityanalysis (line 392)<br /> data = ft_checkdata(data, 'cmbrepresentation', 'full');<br /> </div>
<div>I can see in the help of the function checkdata the following : "cmbrepresentation = sparse, full (applies to covariance and cross-spectral density)". But I don't really understand what "cmbrepresentation" do ... Maybe someone who had a similar problem in the past can help me ? I think I'm missing some optional arguments that I should add.</div>
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<div>Thanks a lot for your help.</div>
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<div>Regards,</div>
<div> </div>
<div>Laetitia Lalla</div>
<div>PhD student in INMED, Marseille, France</div>
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