# histogram bins with different colors

150 views (last 30 days)
Giuseppe Degan Di Dieco on 26 Apr 2021
Hello Everybody,
I'd be glad if you could help me in building a histogram with different color for each histogram bin.
Before asking, I've tried to define for loops and a matrix of colors, without succeding.
My problem is that T.ConstructionYear is a 1531 x 1 numeric vector, and I'd have a different color for each bin. I left auto mode for the number of bins choice.
I've also tried to write the function for just two bins.
Thanks in advance for the help.
h1 = histogram(T.ConstructionYear, 'FaceColor', 'b');
xlabel('ConstructionYear');
ylabel('Number of Bridges');
title('Distribution of Construction Year Data');

Scott MacKenzie on 26 Apr 2021
Edited: Scott MacKenzie on 26 Apr 2021
I'm not sure if you can do this with histogram. Here's what I put together using histcounts and bar instead:
d1 = rand(1531,1); % put your T.ConstructionYear data here
myColor = rand(10,3); % 10 bins/colors with random r,g,b for each
d2 = histcounts(d1);
b = bar(d2, 'facecolor', 'flat');
b.CData = myColor;
xlabel('ConstructionYear');
ylabel('Number of Bridges');
title('Distribution of Construction Year Data');
Giuseppe Degan Di Dieco on 18 May 2021
Thanks Scott!
Wow, with your tip I got a figure that occupies the entire screen.
I didn't know it.
Best!

Giuseppe Degan Di Dieco on 4 May 2021
Edited: Giuseppe Degan Di Dieco on 4 May 2021
As a follow up to this thread, I've developed the below script to show the legend of multiple bars.
I've found some posts on this wonderful community, and then put them together.
%How to have a legend for each bin. For starting, trial with two bins and
%with a for loop
d1 = rand(2, 1); %a random-value 2 x 1 vector
myColor = rand(2, 3); %2 bins/color triplet with random r, g, b for each
d2 = histcounts(d1); %apply the histcounts function to the data
hold on
for i = 1:length(d1)
b = bar(d1(i), d2);
b.CData(i, :) = myColor(i, :);
end
b.BarWidth = 0.4;
xlabel('Construction Year');
ylabel('Number of Bridges');
title('Distribution of Construction Year Data');
legend('location', 'bestoutside')
hold off

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