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<p class="MsoNormal"><span style="font-family:Helvetica">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica">I am new to Fieldtrip and am trying to compare ERPs between two conditions using the following lines of code. ‘data_iccleaned’ is the processed data structure. The code below is in red and my message
in black. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg=[];</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.keeptrials = 'yes';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.vartrllength=1;</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.trials = find(data_iccleaned.trialinfo(:,1) == 1);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">erp_pictures = ft_timelockanalysis(cfg, data_iccleaned);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"></span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg=[];</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.keeptrials = 'yes';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.vartrllength=1;</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.trials = find(data_iccleaned.trialinfo(:,1) == 2);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">erp_abstract = ft_timelockanalysis(cfg, data_iccleaned);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">%Baseline Correction</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"></span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg=[];</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfg.baseline = [twin(1) 0];</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">erp_pictures_TL = ft_timelockbaseline(cfg, erp_pictures);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">erp_abstract_TL = ft_timelockbaseline(cfg, erp_abstract);</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"></span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfgp=[];</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfgp.interactive = 'yes';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfgp.layout = 'easycapM11.mat';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfgp.box='yes';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">cfgp.showoutline = 'yes';</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red">ft_multiplotER(cfgp, erp_pictures_TL,erp_abstract_TL.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:black">When I run the last line of code, I get the following error:</span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"><img width="736" height="83" id="Picture_x0020_2" src="cid:image001.png@01D21D6A.13970950"></span><span style="font-family:Courier;color:red"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:red"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Courier;color:black">I believe the problem is that erp_abstract.time and erp_picture.time are of different lengths (please see the picture below). We have sampled the data at 1000 Hz
and each trial is approx. 8 seconds long (trial lengths vary from 7989 to 8012 points). To circumvent the problem, I tried an additional constraint on the accepted trials (accept only those that are exactly 8000 points) but that did not solve the problem.
What am I doing wrong? </span><span style="font-family:Courier;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><img width="405" height="621" id="Picture_x0020_1" src="cid:image002.png@01D21D6A.13970950"></span><span style="font-family:Helvetica"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman"">-- <o:p></o:p></span></p>
<div>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">Tarkeshwar Singh <o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">Postdoctoral Scholar<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">Department of Health Sciences and Research<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">Medical University of South Carolina<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">77 President Street, Room C305<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:Helvetica">Charleston, SC 29425<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><a href="mailto:hertzfel@musc.edu"><span style="color:#0B4CB4">singht@musc.edu</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Helvetica"><o:p> </o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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