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<p class="MsoNormal"><span lang="EN-GB">Hi Fieldtrippers, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal">To get a feeling of my data I want to visually inspect the data and look where are differences between the
<span class="searchhit">conditions</span> <o:p></o:p></p>
<p class="MsoNormal">by plotting the grand-averages of TFRs. <o:p></o:p></p>
<p class="MsoNormal">By using <b><span style="color:black">ft_freqgrandaverage</span></b><span style="color:black"> I noticed that it gives back
<b>NaN</b> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">if freq entries for one time bin are missing for one subject (n=28).
<o:p></o:p></span></p>
<p class="MsoNormal"><img width="623" height="165" id="Picture_x0020_3" src="cid:image003.jpg@01CE05F4.DAF32510"><span style="color:black"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="color:black"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:black">sSTOP, 2. cAC, 3. diff<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">In my data with variable trial lengths, the shortest poststim time point is around 0.06 s in one condition (cAC) and in one subject<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">but I expect my effects around 0.1-0.35 s.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">How can I overcome this problem? Is there a more appropriate fieldtrip function or do I have to write a special self-made Matlab code?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Here is an excerpt of my code:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">GA_sSTOP = ft_freqgrandaverage(cfg, AllSubjMat_sSTOP{1,:});<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">% where AllSubjMat_sSTOP contains TFRs of all subjects in a <1x28 cell><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">GA_cAC = ft_freqgrandaverage(cfg, AllSubjMat_cAC{1,:});<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">GA_diff.powspctrm = (GA_sSTOP.powspctrm - GA_cAC.powspctrm) ./ (0.5*GA_sSTOP.powspctrm + 0.5*GA_cAC.powspctrm);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Many thanks for your help!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Cheers, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Patrick<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="color:black"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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