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</o:shapelayout></xml><![endif]--></head><body lang="DE" link="#0563C1" vlink="#954F72"><div class="WordSection1"><p class="MsoNormal">Dear FieldTrip – Community,<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><span lang="EN-GB">My goal is to analyse changes of Granger Causality over a certain time period.<o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-GB">Here is the code I use to calculate the wavelet analysis:<o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">data.label = {</span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH1'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH2'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH3'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH4'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH5'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH6'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">; </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'CH7'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">};</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">data.fsample = 1000; </span><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">% Sampling rate of 1kH</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">data.time{1} = 1:600000;</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">data.trial{1} = Output_data'; </span><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">% Matrix organised as follows: 7 chan x 600000 samples<o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New""><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">%% Wavelets for time-frequency power analysis</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg = [];</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg.output = </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'powandcsd'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">;</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg.method = </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'wavelet'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">;</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg.foi = 1:48; </span><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">% Frequency range from 1 to 48Hz </span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg.t_ftimwin = ones(length(cfg.foi),1).*0.5; </span><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">% length of time window = 0.5 sec</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg.toi = 0:600; </span><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">% 600 seconds (10min) time period</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">freq_data = ft_freqanalysis(cfg, data);<o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black"><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black">Up to this point everything seems to be correct, but the granger analysis only gives my NaNs.<o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New""><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:forestgreen">%% Granger causality analysis</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg_conn = [];</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">cfg_conn.method = </span><span lang="EN-GB" style="font-family:"Courier New";color:#A020F0">'granger'</span><span lang="EN-GB" style="font-family:"Courier New";color:black">;</span><span lang="EN-GB" style="font-family:"Courier New""><o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black">granger_str = ft_connectivityanalysis(cfg_conn, freq_data); <o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-family:"Courier New";color:black"><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black">Does anyone has a suggestion what might be the mistake in my code?<o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black"><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black">Thank you very much and best regards<o:p></o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black"><o:p> </o:p></span></p><p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="color:black">Daniel</span><span lang="EN-GB"><o:p></o:p></span></p><p class="MsoNormal"><span lang="EN-GB" style="font-size:12.0pt"><o:p> </o:p></span></p></div></body></html>