histogram bins with different colors

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Giuseppe Degan Di Dieco
评论： Giuseppe Degan Di Dieco 2021-5-18
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');

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Scott MacKenzie
Scott MacKenzie 2021-4-26
编辑：Scott MacKenzie 2021-4-26
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');
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Scott MacKenzie
Scott MacKenzie 2021-5-18
Yup. Still getting threads here. Nice work. Congratulations. Arch masonry bridges rule! :)
You've got a lot going on in that chart. Are you using "full screen"? You can do this using
f = gcf;
f.WindowState = 'maximize'; % full screen
You can also play with the size of the tick label fonts using the axis FontSize property. Good luck.
Giuseppe Degan Di Dieco
Giuseppe Degan Di Dieco 2021-5-18
Thanks Scott!
Wow, with your tip I got a figure that occupies the entire screen.
I didn't know it.
Best!

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Giuseppe Degan Di Dieco
编辑：Giuseppe Degan Di Dieco 2021-5-4
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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