Eylem
September 2, 2022, 11:41am
1
Dear MNE,
For visualization of our 64 channels EEG data in MATLAB, we would like to use the spatial color coding as illustrated/stated on your webpage:
https://mne.tools/stable/auto_tutorials/evoked/20_visualize_evoked.html
Regarding this we have the following questions:
How can we integrate your python function “spatial_colors” into our MATLAB code?
How can we assign the color codes onto different number of channels, such as 32, 64, 128, or 256 channels? Is there a certain convention for different number of channels? The example on the webpage is for 102 channels/magnetometers.
Kind regards,
richard
September 4, 2022, 9:36am
2
Hello @Eylem and welcome to the forum!
MNE-Python uses a very simple function to convert the (X, Y, Z) coordinates of channels / sensors into RGB colors:
def _rgb(x, y, z):
"""Transform x, y, z values into RGB colors."""
rgb = np.array([x, y, z]).T
rgb -= rgb.min(0)
rgb /= np.maximum(rgb.max(0), 1e-16) # avoid div by zero
return rgb
It should be trivial to re-implement this in Matlab.
Best wishes,
3 Likes
Eylem
September 15, 2022, 7:08am
3
Dear @richard ,
As you pointed out, we were easily able to implement the smart idea of mapping (x, y, z) to RGB in Matlab.
Thank you very much for your prompt support!
Best,
2 Likes