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<p class="MsoNormal">Hi All<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am trying to read in my data in which the first channel contains the marker signal (spike) superimposed on the trigger channel.<u></u><u></u></p>
<p class="MsoNormal">I would like to use mytrialfun before ft_definetrial. To do this I would like to check the value of the marker channel and compare it with mean value of the channel and record that value in the even field.<u></u><u></u></p>
<p class="MsoNormal">But I guess I can’t do it as the fieldtrip doesn’t read the channel values before ft_definetrial. Can I use data channel values in mytrialfun? If not, is there a way around this?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Here is my trialfun<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:blue">function</span><span style="font-size:10.0pt;font-family:"Courier New","serif""> [trl, event] = mytrialfun(cfg)</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:forestgreen">% read the header information and the events from the data</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif"">hdr = ft_read_header(cfg.datafile);</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif"">event = ft_read_event(cfg.datafile,</span><span style="font-size:10.0pt;font-family:"Courier New","serif";color:#a020f0">'trigindx'</span><span style="font-size:10.0pt;font-family:"Courier New","serif"">,1,</span><span style="font-size:10.0pt;font-family:"Courier New","serif";color:#a020f0">'threshold'</span><span style="font-size:10.0pt;font-family:"Courier New","serif"">,5e2,</span><span style="font-size:10.0pt;font-family:"Courier New","serif";color:#a020f0">'detectflank'</span><span style="font-size:10.0pt;font-family:"Courier New","serif"">,</span><span style="font-size:10.0pt;font-family:"Courier New","serif";color:#a020f0">'up'</span><span style="font-size:10.0pt;font-family:"Courier New","serif"">);</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:forestgreen">% search for "trigger" events according to 'trigchannel' defined outside the function</span><font><span style="font-family:"Courier New","serif""></span></font></p>
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</font><p class="MsoNormal" style><font><span style="font-family:"Courier New","serif"">The problem lies here</span></font></p><p class="MsoNormal" style><font><span style="font-family:"Courier New","serif""></span></font><b><span style="font-size:14.0pt;font-family:"Courier New","serif""></span></b></p>
<p class="MsoNormal" style="text-autospace:none"><font size="4"><b><span style="font-family:"Courier New","serif"">value = [event(find(cfg.trialdef.trigchannel<font color="#ff0000"> (it needs data of this channel & not channel name)</font>)>mean(cfg.trialdef.trigchannel)+500)]</span></b></font><span style="font-size:10.0pt;font-family:"Courier New","serif";color:forestgreen">
%mkrchannel is data.trial{1}(1,:));</span><span style="font-size:12.0pt;font-family:"Courier New","serif""></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u> <u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:forestgreen">% creating your own trialdefinition based upon the events</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:blue">for</span><span style="font-size:10.0pt;font-family:"Courier New","serif""> j = 1:length(value);</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif""> trlbegin = sample(j) + pretrig;</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif""> trlend = sample(j) + posttrig;</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif""> offset = pretrig;</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif""> newtrl = [ trlbegin trlend offset];</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif""> trl = [ trl; newtrl];
</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Courier New","serif";color:blue">end</span><span style="font-size:12.0pt;font-family:"Courier New","serif""><u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks in advance<u></u><u></u></p>
<p class="MsoNormal">Best regards<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></p><span class="HOEnZb"><font color="#888888">
<p class="MsoNormal">Harsimrat<u></u><u></u></p>
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