[Eeglablist] Plotting more than one difference wave on one plot

[Arnaud Delorme]

Dear Mary-Jane,

by the way, you may also use the std_plotcurve function to plot standard error of the ERP for each condition (as in the small figure attached)

[STUDY erpdata erptime]= std_erpplot(STUDY,ALLEEG,'channels',{'CZ'});
std_plotcurve(erptime, erpdata, 'plotconditions', 'together', 'plotstderr', 'on', 'figure', 'on');

this function also has an option 'plotdiff' to plot the difference between 2 conditions.
Best,

Arno



On 23 Aug 2013, at 23:40, Arnaud Delorme wrote:

> Dear Mary-Jane,
> 
> there is a solution to do this in the graphic interface (menu item "Plot > Sum/compare ERPs). Then you may check the option to subtract conditions. 
> 
> At the STUDY level, it is currently not possible to plot differences using the graphic interface. However, plotting differences from the command line is pretty easy. For example, after creating a STUDY and pre-computing ERP, you may calls the function that plots ERP in STUDY (assumes 2 conditions) on channel 'cz' (I copied the first line from the EEGLAB history)
> 
> [STUDY erpdata erptime]= std_erpplot(STUDY,ALLEEG,'channels',{'CZ'});
> figure;
> plot(erptime, mean(erpdata{1},2), 'r'); % plot first condition in red
> plot(erptime, mean(erpdata{2},2), 'b'); % plot second condition in red
> plot(erptime, mean(erpdata{2},2)-mean(erpdata{1},2), 'k-'); % plot difference in black dashed
> 
> That's it. Note that this is what erpdata contains
> 
> erpdata = 
> 
>     [750x12 double]
>     [750x12 double]
> 
> It is 12 subjects 750 points and 2 conditions.
> Best,
> 
> Arno
> 
> On 23 Aug 2013, at 19:46, Makoto Miyakoshi wrote:
> 
>> Dear Mary-Jane,
>> 
>> The default EEGLAB does not have a solution for it.
>> 
>> If you are trying to plot IC ERP and not channel ERP, please try my plugin (alpha version). Note this plugin is for STUDY level, but you can create STUDY with n=1. Unzip it and locate the folder under /eeglab/plugins and reboot eeglab.
>> 
>> I haven't tried it personally, but ERPLAB may do it.
>> http://erpinfo.org/erplab
>> 
>> Sometimes something very fundamental is missing from EEGLAB... 
>> 
>> Makoto
>> 
>> 
>> 2013/8/22 Budd, Mary-Jane S <mbudd at essex.ac.uk>
>> Dear List,
>> I would like some help on plotting difference waves. I would like to plot
>> the difference of two conditions (C1 minus C2) and plot this difference wave
>> on the same plot as the difference of two other conditions (A1 minus A2).
>> Could someone tell me how to do this through the EEGlab GUI?
>> Thank you,
>> Mary-Jane
>> 
>> ----------------------
>> Dr Mary-Jane Budd
>> Senior Research Officer
>> Department of Psychology
>> University of Essex
>> Wivenhoe Park
>> Colchester CO4 3SQ
>> UK
>> 
>> Room 4.726
>> 
>> http://www.essex.ac.uk/psychology/department/people/Budd.html
>> 
>> 
>> _______________________________________________
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>> 
>> 
>> -- 
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>> <std_erpcalc.zip>_______________________________________________
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