Normalization of colorbar showing bincounts of binscatter

Question

Sumera Yamin 2019-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/475583-normalization-of-colorbar-showing-bincounts-of-binscatter

编辑： Adam Danz 2019-8-12

I am using bin scatter to plot my 2D data. I want to normalize my bin counts from 0-1 in the color bar instaed of absolute number. I guess its a basic proble, but i am stuck. Any help will be highly appreciated. the example code is shown below. Thank you very much.

x=rand(1,10000);
y=rand(1,10000);
binscatter(x,y,[100,100])
colormap(gca,'jet')

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Answer 1

Adam Danz 2019-8-9

2
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https://ww2.mathworks.cn/matlabcentral/answers/475583-normalization-of-colorbar-showing-bincounts-of-binscatter#answer_387008

编辑：Adam Danz 2019-8-12

在 MATLAB Online 中打开

I would use histcounts2() to determine the density within each bin. Then you can normalize those data and send it into histogram2(). See comments within the code below for details.

x=rand(1,10000);
y=rand(1,10000);
% compute bin counts
[binCounts, xbin, ybin] = histcounts2(x,y,[100,100]); 
% Normalize bin counts to 0:1
binCountsNorm = (binCounts - min(binCounts(:))) ./ range(binCounts(:)); 
% Plot the results *
histogram2('XBinEdges',xbin,'YBinEdges',ybin,'BinCounts',binCountsNorm, ...
    'DisplayStyle','tile','ShowEmptyBins','on') % or you may what "off"
% Add color bar and make sure the color ranges from 0:1
colorbar()
caxis([0,1])

*The histogram2() options require r2016b or later:

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Adam Danz 2019-8-12

编辑：Adam Danz 2019-8-12

Great! In the image you shared, empty bins appear as white. In my version, they appear as dark blue (which is 0 on the colorbar). If you'd rather them appear as white set 'ShowEmptyBins', to 'off'.

Sumera Yamin 2019-8-12