[Simnibs-discuss] Normal component E-field in Matlab after optimization

[fangc]

Dear Steven,

The attribute 'map_to_surf' will map your results to the gray matter 
central surface and not give you the normal component of the E field. 
What you want to do might be a little post-processing. I do not know 
which language you use for your development, but in python you can 
simply do the following, for example, if you have a mesh in FsAverage 
space:

field_name = 'E_normal'
results_fsavg.field[field_name].value

You can find more details here:
https://simnibs.github.io/simnibs/build/html/tutorial/advanced/group_analysis.html?highlight=normal

It also has a Matlab example for the same purpose. Good luck. And please 
let us know if you have further questions.

Best,
Fang

On 2021-06-08 12:38, Beumer, Steven wrote:
> Dear SimNibs team,
> 
> I am writing a little MATLAB app to do optimizations in SimNibs via a
> GUI, which is going very well.
> 
> In the GUI I would like to plot the fields and the histogram, which I
> do via the standard data reading scripts, however I have troubles
> getting the normal component of the E-field.
> 
> I tried giving the optimization structure a map_to_surf = true
> attribute, which does not work. Is there a way to get the normal
> component without doing the simulation afterwards with the optimized
> electrodes?
> 
> Kind regards and a lot of thanks in advance,
> 
> Steven Beumer
> 
> PhD student at the Eindhoven University of Technology
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