[Eeglablist] problems with plotting data in eeglab

[Danielle Farrar]

Hey EEGLab users,
I have a further refinement on my question from yesterday.  When I do the
following:


figure; erp = pop_erpimage(EEG,1, [5],[],strsetname,4,1,{},[],'' ,
'yerplabel', '\muV', 'erp', 'on', 'limits',[NaN NaN -25 25 NaN NaN NaN NaN]
, 'cbar', 'on', 'vert',[170 300] ,'topo', { [5] EEG.chanlocs EEG.chaninfo }
);

The erp variable now contains a matrix of data with 43 columns.  Since the
dataset contains 46 events, I was wondering what is contained within these
43 columns?  The numbers are close but short a few ...

It seems that if they contain the data for each trial, I could use matlab to
average them and then plot the curve directly using matlab, instead of the
eeglab tools.  My end goal would be to feed this plot to a subplot, and put
many other datasets on the same figure.

Does this make sense?  Does anyone have any experience or suggestions for
this?

Thanks!
Danielle Farrar


On Thu, Jul 16, 2009 at 2:23 PM, Danielle Farrar
<danielle.farrar at gmail.com>wrote:

> Hey everyone,
> I'm new to matlab and eeglab, and trying to put together a series of ERP
> plots to look at and compare a series of them.  I am trying to do a couple
> of things
> 1) I would like to be able to extra the single-channel ERP wave (preferably
> the one from the erp image).  I just want the wave and not the color map.  I
> would like to them put a series of these in a subplot, to be able to compare
> them.  I understand how to get the whole image in there, doing something
> like this:
> subplot(5,3,2); erp = pop_erpimage(EEG,1, [5],[],'Kip 062909 Control 1
> Rare',9,1,{},[],'' , 'yerplabel', '\muV', 'erp', 'on', 'limits',[NaN NaN -25
> 25 NaN NaN NaN NaN] , 'cbar', 'off', 'vert',[170 300] );
> However, I would really prefer *just* to insert the erp average wave - I
> have a large series of waves to plot and there isn't enough space to include
> the color image as well.
>
> Also, I would like to be able to overlay a couple of different
> waves/averages.  For instance, I have four waves -- two representing the
> ERPs from common stimulus, two representing the ERPs from the rare stimulus.
>  I would like to be able to group them into averages, and then put them on
> the same plot.  It seems like the ERP average/compare tool either lets you
> average them *all* or it lets you average them all individually, but I would
> like to be able to combine/overlay two averages.
>
> Thanks so much for your help in advance.
>
> Danielle
>
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