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highlight Nodecolor for a graph using a color map (JET)

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Sha
Sha on 30 Sep 2020
Commented: Sha on 1 Oct 2020
Hi,
I have plotted a graph with n nodes.
Each node has an "attribute" or a value from -1 to 1 stored in a vector K.
I would like to color the nodes using these attributes so for example if node 1 has attribute value "-1" then with the "JET" colormap on Matlab it would appear in Blue.
Is there a way to achieve this ?
I tried the following but clearly it doesn't work (returns error, it's wrong):
jetcustom=jet(n);
r1=K(1,:); %list of attributes
colors = interp1(linspace(-1, 1, n), jetcustom, r1.');
figure()
a=graph(A);
p=plot(a,'Layout','force');
for i=1:n
highlight(p,i , 'NodeColor', colors(i));
end

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Accepted Answer

Christine Tobler
Christine Tobler on 30 Sep 2020
Since colors is a n-by-3 array, use colors(i, :) to access the complete row that represents the color for node i. You can also use
p=plot(a,'Layout','force','NodeColor',colors)
instead of the for-loop with highlight, or you could try to have MATLAB's colormap work in the background without explicitly setting the colors:
p=plot(a,'Layout','force','NodeCData',r1);
colorbar
colormap jet

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