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Change color on a single bar

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Alessandro Ruda
Alessandro Ruda am 9 Mär. 2021
Kommentiert: Alessandro Ruda am 10 Mär. 2021
Dear MatLab comunity,
I have a problem in changing color on a single or multiple bars in a normal and easy bar graph.
I tried the following:
%% Load Data
RMSD_UDP = load('rmsf_UDP.dat');
% Assign variables
n = RMSD_UDP(:,1); %number of residue
x_UDP = RMSD_UDP(:,2); %RMSF for given residue
%Figure
figure
hold on
title('RMSF UDP');
w1 = 0.5;
b = bar(n,x_UDP,w1)
b.FaceColor = 'g';
b.CData(2,:) = [.5 0 .5];
b.CData(44,:) = ['k'];
xlabel('Residue');
ylabel('RMSF');
xlim([0 364])
ylim([0 5])
It doesn't work but I don't know if it's the MatLab version (R2017a). I tried it on one of the latest ones and it didn't work either. there must be some detail i am not seeing.
Any idea?
Have a nice day,
Alex

Akzeptierte Antwort

Adam Danz
Adam Danz am 9 Mär. 2021
Bearbeitet: Adam Danz am 9 Mär. 2021
  7 Kommentare
Adam Danz
Adam Danz am 9 Mär. 2021
No, that's now how to set CData. You don't lose that opportunity; you never had it in the first place.
The documentation for CData states "By default, when you create a bar chart, the CData property contains a three-column matrix of RGB triplets. You can change the color for a particular bar by changing the corresponding row in the matrix. This property applies only when the FaceColor or EdgeColor property is set to 'flat'."
It won't throw an error because characters are converted to double but the colors will be unrelated to the color characters.
To set the color of several bars,
b.CData(10:20,:) = [1 0 0] .* ones(11,1); % for 11 rows (10:20)
Alessandro Ruda
Alessandro Ruda am 10 Mär. 2021
Thank you very much Adam

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