change colors for each bins in histogram

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bero
bero 2016-2-28
编辑： Marion Baques 2022-2-2
Hi, I have attached sample data, I plot histogram for the sample data as: hist = histogram(sample)
I need to color each bin(group of values) in different, and put annotation text in figure what each color represent :

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Walter Roberson
Walter Roberson 2016-2-28
From R2014b onwards, the only way to do it is to bar() in each entry one at a time, specifying the color you want. Well, you could also use patch() or fill() or rectangle() to put in the bars; the point is that histogram objects do not allow you to change the bar colors individually now.
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bero
bero 2016-2-28
Could you please do it for 2 entry with the annotation text??in any sample example... Thx

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Srivathsan Iyengar
Srivathsan Iyengar 2019-12-5
编辑：Srivathsan Iyengar 2019-12-5
One way to do it is to overlay multiple histogram plots on the same axes, one plot for each bin. This makes sense for reasonable number of bins, not for large number of bins.
Here's an example code:
load sample.mat;
xValues = unique(sample);
binColors = [repmat(reshape(repmat(0:0.5:1,9,1),27,1),1,1) repmat(reshape(repmat(0:0.5:1,3,1),9,1),3,1) repmat(reshape(repmat(0:0.5:1,1,1),3,1),9,1)];
hf = figure; hax = axes; hold on;
legendStr = cell(1,length(xValues));
for i=1:length(xValues)
histogram(hax, sample(sample == xValues(i)), 'FaceColor',binColors(i,:));
legendStr(i) = {num2str(xValues(i))};
end
legend(legendStr);
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Charmi Patel
Charmi Patel 2022-2-1
Hello Marion,
Thank you for your solution. It was really helpful to me. But I get an error on the line colormap('jet',56) on R2021b version that first argument must be scalar axes or figure handle. Can you please confirm which version are you using? Also it would be great if you have some solution to this
Thanks!
Marion Baques
Marion Baques 2022-2-2
Hello Charmi,
I think the error comes from the way the colormap function is written. It is my mistake as I use the crameri colorscale (scientific colorscale). If you write "colormap(jet(56))", it works. I tried for me and it is working the same.
Hope this solves your problem!

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