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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Min Sheng,<br>
<br>
I think that it may be easier to rename your events form the command line so that you can segment your conditions separately.<br>
<br>
e.g.<br>
<br>
If your event labels are 'stim', and you know that the first condition consists of 'stim' events 2-97:<br>
<br>
<font face="Courier New">%make sure that the events are stored in chronological order...<br>
EEG=eeg_checkset(EEG,'eventconsistency');<br>
<br>
%initiate an event counter...<br>
event_count=0;<br>
<br>
%loop through all of the events...<br>
for event_index=1:length(EEG.event)<br>
<br>
%check that the type is 'stim'...<br>
if strcmp(EEG.event(event_index).type, 'stim')<br>
<br>
</font>
<div><font face="Courier New"> %increase the event counter by 1...<br>
event_count=event_count+1;<br>
<br>
%check that the event counter is in your target range....<br>
if event_count>1 && event_count<98<br>
<br>
%change the name of your event to include a code for condition 1 (e.g. '_C1')<br>
EEG.event(event_index).type=[EEG.event(event_index).type,'C1'];<br>
<br>
end<br>
<br>
%break out of the loop after it renames the 97th 'stim' event...<br>
if event_count==97<br>
break<br>
end<br>
end<br>
end</font><br>
<br>
<div style="font-family:Tahoma; font-size:13px">
<div class="BodyFragment"><font size="2"><span style="font-size:10pt">
<div class="PlainText"><br>
Once this is done you will be able to segment normally to condition 1 by choosing 'stimC1' event types, and condition 2 by choosing 'stim' event types.<br>
<br>
<br>
<br>
James Desjardins, MA<br>
Electrophysiology Technologist<br>
Cognitive and Affective Neuroscience Lab, Psychology Department <br>
Jack and Nora Walker Centre for Lifespan Development Research<br>
Brock University<br>
500 Glenridge Ave.<br>
St. Catharines, ON, Canada L2S 3A1<br>
905-688-5550 x4676<br>
--<br>
"'Cause you never can tell What goes on down below!<br>
"This pool might be bigger Than you or I know!"<br>
<br>
McElligot's Pool<br>
Dr.Seuss 1947</div>
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<div style="direction: ltr;" id="divRpF237658"><font color="#000000" face="Tahoma" size="2"><b>From:</b> eeglablist-bounces@sccn.ucsd.edu [eeglablist-bounces@sccn.ucsd.edu] on behalf of Min Sheng [Min.Sheng@utsouthwestern.edu]<br>
<b>Sent:</b> August-30-13 6:01 PM<br>
<b>To:</b> eeglablist@sccn.ucsd.edu<br>
<b>Subject:</b> [Eeglablist] how to create new data sets based on the number of event<br>
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<p class="MsoNormal">Dear all;</p>
<p class="MsoNormal">I am processing visual ERP data, I have 768 events which under 2 different conditions( room air and hyperoxia). I did not mark these two conditions when record EEG data but I know the time period of each conditons.</p>
<p class="MsoNormal">Such as from event 2 to event 97 was under room air. So can I extract this period and create a new dataset to do further analysis? I want to compare ERP under these two conditions.</p>
<p class="MsoNormal">Thanks</p>
<p class="MsoNormal">Min Sheng</p>
<p class="MsoNormal"> </p>
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<br>
<hr>
<font color="Blue" face="Arial" size="2"><br>
UT Southwestern Medical Center<br>
The future of medicine, today.<br>
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