[Eeglablist] Defining lo/hi limits for topoplots

[Stephen Politzer-Ahles]

Scott,

Thanks a lot, that solves the problem! I had been thinking [-3 3] refered to
microvolts, which was not the case....when I use much smaller range limits,
the topoplots look fine.

Best,
Steve Politzer-Ahles

On Sun, Mar 6, 2011 at 2:46 PM, Scott Makeig <smakeig at gmail.com> wrote:

> Likely your |data values| are << 3. Check min(range) and max(range)...
>
> On Fri, Mar 4, 2011 at 9:38 PM, Stephen Politzer-Ahles <
> politzerahless at gmail.com> wrote:
>
>> Hello everyone,
>>
>> I am a new EEGLAB user and am trying to make topoplots of multiple effects
>> and time windows to compare within the same figure; I would like to set the
>> same min/max scale values for all the topoplots. I have tried using input
>> like ('maplimits',[-3 3]) within the call to topoplot(), but while that
>> creates topoplots that seem to have the right scale (e.g. -3uv to 3uv), the
>> plots themselves are just one plain color (that is to say, the whole plot is
>> 0) even though there should be visible effects. Could anyone show me an
>> example of how to define the maplimits in the topoplot() function? Any help
>> would be greatly appreciated.
>>
>> Here is the code I am trying to run:
>>
>> figure;
>>
>> [signal, variance, chan_names, pnts, rate, xmin, xmax] =
>> loadavg('trig4-trig5.avg');
>> locations = readlocs('32chan_new.loc' );
>> range = mean(signal(:,350:500 ),2);
>> subplot(2,3,1),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('150-300 ms')
>> range = mean(signal(:,500:700 ),2);
>> subplot(2,3,2),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('300-500 ms')
>> range = mean(signal(:,800:1100 ),2);
>> subplot(2,3,3),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('600-900 ms')
>>
>> [signal, variance, chan_names, pnts, rate, xmin, xmax] =
>> loadavg('trig6-trig7.avg');
>> locations = readlocs('32chan_new.loc' );
>> range = mean(signal(:,350:500 ),2);
>> subplot(2,3,4),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('150-300 ms')
>> range = mean(signal(:,500:700 ),2);
>> subplot(2,3,5),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('300-500 ms')
>> range = mean(signal(:,800:1100 ),2);
>> subplot(2,3,6),topoplot(range,locations,'plotrad',.51,'conv','off','electrodes','off','maplimits',[-2
>> 2]); title('600-900 ms')
>>
>> Thank you,
>> Steve Politzer-Ahles
>>
>>
>> --
>> Stephen Politzer-Ahles
>> University of Kansas
>> Linguistics Department
>> http://www.linguistics.ku.edu/
>>
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>
>
>
> --
> Scott Makeig, Research Scientist and Director, Swartz Center for
> Computational Neuroscience, Institute for Neural Computation & Adj. Prof. of
> Neurosciences, University of California San Diego, La Jolla CA 92093-0559,
> http://sccn.ucsd.edu/~scott
>



-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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