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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I've just started to use Fieldtrip and I don't<o:p></o:p></p>
<p class="MsoNormal">have much experience with Matlab, so I could<o:p></o:p></p>
<p class="MsoNormal">just be making a stupid mistake, but I found<o:p></o:p></p>
<p class="MsoNormal">some very strange behavious when I tried to<o:p></o:p></p>
<p class="MsoNormal">specify my own trailfunction.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I started from the example given on the tutorial<o:p></o:p></p>
<p class="MsoNormal">pages of the wiki. I've indicated the line of interest<o:p></o:p></p>
<p class="MsoNormal">with an additional '->'. This is what I used:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">for i=1:length(event)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> if strcmp(event(i).type, cfg.trialdef.eventtype)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> % it is a trigger, see whether it has the right value<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> if ismember(event(i).value, cfg.trialdef.eventvalue)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> % add this to the trl definition<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> begsample = event(i).sample - cfg.trialdef.prestim*hdr.Fs;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> endsample = event(i).sample + cfg.trialdef.poststim*hdr.Fs - 1;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> offset = -cfg.trialdef.prestim*hdr.Fs;
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> trigger = event(i).value; % remember the trigger (=condition) for each trial<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">-> trl(end+1, :) = [round([begsample endsample offset]) trigger];
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> end<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New""> end<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">end<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">When I use it like this it will clip all sample and<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">offset values at 0 – 65536, that is the limits of an<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">unsigned integer. I had to change the actual line<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">that appends the trial to this to make it work:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:10.0pt;font-family:"Courier New"">trl(end+1, :) = [double(begsample) double(endsample) double(offset) double(trigger)];</span><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">All values are shown by the debugger as doubles<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">anyway, so why this explicit conversion is needed<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">is completely beyond me.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Does anyone of you know what is going on?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">I already asked one of the local Matlab gurus,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">but he was even more amazed than me...<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN" style="font-size:12.0pt;font-family:"Times New Roman","serif"">Maarten<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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