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

[Makoto Miyakoshi]

Once you load the channel info (you can, can't you?) you can directly edit
the xyz values. You probably need to press 'xyz -> polar' or something like
that, too.

Makoto

On Mon, Nov 17, 2014 at 12:40 PM, Markus Gschwind <markus.gschwind at gmail.com
> wrote:

> Dear Makoto,
>
> Thanks for the answer.
>
> If I will have to go over the manual change of xyz could you give me some
> hint of how to do it?
>
> Thanks so much!
> Markus
>
> 2014-11-15 19:33 GMT+01:00 Makoto Miyakoshi <mmiyakoshi at ucsd.edu>:
>
>> Dear Markus,
>>
>> I don't think there is a supported graphical editor that takes care of
>> it. You can manually change the xyz (or other coordinate parameter) values,
>> but it would not be that convenient.
>>
>> Makoto
>>
>> On Thu, Nov 13, 2014 at 10:06 AM, Markus Gschwind <
>> markus.gschwind at gmail.com> wrote:
>>
>>> Dear Steven,
>>>
>>> Thank you very much for your detailed answer. But I fear I still was not
>>> clear.
>>>
>>> I do not talk about display. I want do modify the topography itself and
>>> SAVE the modified topography in a new one. I want to create artificial
>>> topographies out of existing ones.
>>>
>>> So I need to use the XYZ information from EEG.chanloc like in topoplot
>>> in order to know which electrode is right and which left, but I need to
>>> separate it from the topography (which is a simple vector with 204 numbers
>>> according to the 204 electrodes). I would like to modify the values in the
>>> topography in such a way that it appears as a left-right-flipped version,
>>> or any other operation.
>>>
>>> So my question is if there is a tool which allows to spatially modify
>>> and SAVE the modified topography, not to modify the display!
>>>
>>> Thank you again!
>>> Best, Markus
>>>
>>> 2014-11-13 3:50 GMT+01:00 Stephen Politzer-Ahles <spa268 at nyu.edu>:
>>>
>>>> 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
>>>> list=get(gca,'children').
>>>> 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,
>>>> Steve
>>>>
>>>>
>>>>
>>>> Stephen Politzer-Ahles
>>>> New York University, Abu Dhabi
>>>> Neuroscience of Language Lab
>>>> http://www.nyu.edu/projects/politzer-ahles/
>>>>
>>>> On Thu, Nov 13, 2014 at 2:45 AM, Markus Gschwind <
>>>> markus.gschwind at gmail.com> wrote:
>>>>
>>>>> 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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>>>>
>>>
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>>
>>
>>
>> --
>> Makoto Miyakoshi
>> Swartz Center for Computational Neuroscience
>> Institute for Neural Computation, University of California San Diego
>>
>
>


-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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