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How do I retrieve the RGB data of a scatter plot from the CData values(a 1D vector corresponding to the array lengths X and Y) ?

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I have a scatter plot with x and y vector's as my data. I have colored using another 1D vector z which has the same number of rows as x and y. Now I would like to get the RGB values of the corresponding colors from the CData scalar values.

Accepted Answer

Sangeetha Jayaprakash
Sangeetha Jayaprakash on 24 Jul 2017
You can obtain the indices based on the colormap and the Z vector applied to the CData property. Then you can get the corresponding RGB values using the "ind2rgb" function as follows:
h = scatter(x,y);
h.CData = z;
Cdata = h.CData;
cmap = colormap;
% make it into a index image.
cmin = min(Cdata(:));
cmax = max(Cdata(:));
m = length(cmap);
index = fix((Cdata-cmin)/(cmax-cmin)*m)+1; %A
% Then to RGB
RGB = ind2rgb(index,cmap)
For information on the "ind2rgb" function, refer this link:

More Answers (1)

Walter Roberson
Walter Roberson on 25 Jul 2017
See the file exchange contribution freezeColors which knows how to do the calculations to convert relative value to rgb

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