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) ?

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.

Answer 1

[Sangeetha Jayaprakash]

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:

http://www.mathworks.com/help/matlab/ref/ind2rgb.html

[Sri Vutukuri]

Thank you very much!

Answer 2

[Walter Roberson]

See the file exchange contribution freezeColors which knows how to do the calculations to convert relative value to rgb