Barcharts colours based on other vectors
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Nikolas Spiliopoulos
on 24 Jun 2020
Commented: Nikolas Spiliopoulos
on 25 Jun 2020
Hi all,
I have 3 vectors a,b,c with 4 numbers in each of them
I create another vector d with all the values of vectors a,b,c Sorted.
then I want to plot a barchart of vector d, BUT I would like to have different colours in the bars based on which vector they belong.
Can you help me with this?
for example:
values belong to vector a=green colour
values belong to vector b=blue colour
values belong to vector c=orang colour
Hope the quesiton is clear
thanks in advance
Nikolas
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Accepted Answer
Adam Danz
on 24 Jun 2020
The basic idea is to store the output handle to the bar objects
bh = bar(____);
Set the FaceColor to flat
bh.FaceColor = 'flat';
Redefine the CDdata which defines the color of each bar
colorData = bh.CData; % Current color arrangement.
% Example: change color of bar #2 to red
bh.CData(2,:) = [1 0 0];
% Example: define the colors based on the jet colormap
bh.CData = jet(size(bh.CData,1));
3 Comments
Adam Danz
on 25 Jun 2020
You just need to index the color values accordingly.
a = [10 20 30];
b = [15 25 50];
c = [5 40 80];
d=[a b c];
ID = [ones(size(a)), ones(size(b))+1, ones(size(c))+2];
[d_sorted, sortIdx] = sort(d);
ID_sorted = ID(sortIdx);
bh = bar(d_sorted);
colors = jet(max(ID)); % Define a colormap
bh.FaceColor = 'flat';
bh.CData = colors(ID_sorted,:) % set the colors.
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