[Eeglablist] how to modify and then save topograph maps?

Stephen Politzer-Ahles spa268 at nyu.edu
Wed Nov 12 18:50:57 PST 2014

Hello Markus,

Regarding your second question: you can type 'help topoplot' to see
documentation for the topoplot() function (the same goes for any other
function). In this case, the 'nosedir' parameter allows you to have the
 nose face in other directions. You can also rotate it an arbitrary amount
by using the view() command (there's an example in the help documentation)
or you can do this manually in the Matlab figure by clicking the "Rotate 3D
button", which looks like a cube. When I tried this it seems like I can
only rotate around the z-axis; rotating other ways makes the different
parts of the plot come apart.

Regarding question (1), if you mean to flip the topography so the nose is
still at the top but left means right and right means left, I'm not sure if
there's a built-in way to do that. I was able to do it using this hack, but
maybe someone else knows a better way:
1. Manually rotate the figure around the y-axis; you'll see that the head
circle, electrode markers, contour lines, etc., all disappear (they are
being hidden behind the topography itself, which has a lower z-value than
the rest).
2. Get the handles of all the separate parts of the figure using
3. In  my case, the 8th handle (list(8)) was the one for the topoplot
itself. I'm not sure if this is always the case, or if your figures might
come out different. So anyway, I just set the ZData for this  handle to a
very high number, which put it "behind" the other parts of the figure
(contour lines etc.) and made them appear again:  set(list(8),'ZData',
5+zeros(size(get(list(8),'ZData'))) ). This made the other parts of the
plot visible again.

Hope this helps,

Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab

On Thu, Nov 13, 2014 at 2:45 AM, Markus Gschwind <markus.gschwind at gmail.com>

> Hi all,
> Could anyone point me to a way how to modify a given topography (vector
> with # elements corresponding to EEG.chanloc)
> 1) so as to flip the topography left-right (I understood it is the y axis?)
> 2) rotate around a given angle and axis?
> How can I perform these modifications and the SAVE the new topo-vector in
> a file?
> Thanks in advance!
> Best,
> Markus
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