How can i change color of a specific bin using histogram2 or anything similar

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daniel mitchell 2023-3-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1935559-how-can-i-change-color-of-a-specific-bin-using-histogram2-or-anything-similar

评论： Adam Danz 2023-3-27

采纳的回答： Adam Danz

在 MATLAB Online 中打开

suppose i have some data which i want to cluster into 3D histogram

x = 100*randn(10000,1);

y = 100*randn(10000,1);

h2 = histogram2(x,y,-100:20:100,-100:20:100,'FaceColor','flat')

h2 =

Histogram2 with properties: Data: [10000×2 double] Values: [10×10 double] NumBins: [10 10] XBinEdges: [-100 -80 -60 -40 -20 0 20 40 60 80 100] YBinEdges: [-100 -80 -60 -40 -20 0 20 40 60 80 100] BinWidth: [20 20] Normalization: 'count' FaceColor: 'flat' EdgeColor: [0.1500 0.1500 0.1500] Show all properties

i want to change the color of a specific bin lets say bin which belongs to row and column 5

i would want something like this:

h2.Cdata(5,5,:) = [1 0 0] % set bin color to red
Unrecognized method, property, or field 'Cdata' for class 'matlab.graphics.chart.primitive.Histogram2'.

but theres no Cdata property

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Answer 1

Adam Danz 2023-3-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1935559-how-can-i-change-color-of-a-specific-bin-using-histogram2-or-anything-similar#answer_1201344

在 MATLAB Online 中打开

One way to do this is to plot a histogram for each group.

rng('default') % For reproducibility of this example

x = 100*randn(10000,1);

y = 100*randn(10000,1);

[N, xEdges, yEdges] = histcounts2(x,y,-100:20:100,-100:20:100);

% Plot group 1

N1 = N;

N1(5,5) = 0;

h0 = histogram2('XBinEdges',xEdges,'YBinEdges',yEdges,'BinCounts',N1,'FaceColor','Flat');

% Plot group 2

N2 = N(5,5);

hold on

h1 = histogram2('XBinEdges',xEdges(4:5),'YBinEdges',yEdges(4:5),'BinCounts',N2,'FaceColor','r');

Another solution may be to use bar3 with a width of 1 but that has the following issues

bar3 does not have an x input. Solution is to adjust the x values after plotting.
the y input to bar3 defines the center of each bin, not the edge. Solution is to compute the centers.
defining colors to individual bars might be tricky since a handle is returned for each row along the x axis