How to create curve in a plot scatter figure?
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Dennis Huver
il 30 Ago 2017
Commentato: Dennis Huver
il 31 Ago 2017
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/166957/image.jpeg)
I am trying to create a curve in the plot, to show me density of the data(the dots). The curve needs to go up/down according to the scatter density, so that I can see where is most dense, where least and so on. I hope you get the picture. Thanks
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Steven Lord
il 30 Ago 2017
Use histcounts to count how much data is located in each bin along the X axis. Use the counts and edges in creating your plot. Alternately, use histogram with 'DisplayStyle', 'stairs'.
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José-Luis
il 31 Ago 2017
Modificato: José-Luis
il 31 Ago 2017
Convoluted way just to avoid repeating Steven's answer:
data = randn(5000,2); %First column xData, second column yData
[f,x] = ecdf(data(:,2));
[n,c] = ecdfhist(f,x,200);
x_val = linspace(min(data(:,1)),max(data(:,1)),200);
plot(data(:,1),data(:,2),'k.','LineWidth', 2);
hold on;
plot(c,n.*3,'r--')
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