how to plot contour lines on Joint Histogram plot
20 次查看(过去 30 天)
显示 更早的评论
Hi all,
I am plotting joint histogram by using histogram2 as shown in figure.
I need contour lines to differentiate each color which gives clear picture of data distribution means lines to separate each color .
Can anyone help me with this?
my code for this plot as follows:
clf
figure(1)
Yedges = [0.25:.25:100];
Xedges = [50:2.5:350];
h= histogram2(olr,rf,Xedges,Yedges,'DisplayStyle','tile','FaceColor','flat')%,'Normalization','pdf')
colorbar;
colormap(hsv(15))
ylim([0 100])
ax=gca;
ax.CLim=[0 100]
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/531469/image.png)
And, The kind of figure I want should look like(plotted in Rstudio):
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/534624/image.png)
Thanks,
Utkarsh
2 个评论
采纳的回答
Cris LaPierre
2021-3-6
编辑:Cris LaPierre
2021-3-6
I'll share a couple thoughts about how I would try to approach this.
In order to create a contour plot, MATLAB requires the inputs to be matrices. Each row corresponds to a value on the Y axis, and each column corresponds to a value on the X axis. This means the data needs to be arranged in an evenly spaced grid.
For your data, that means dividing the XY plane into bins, and counting the number of points in each bin. You can do this using histcounts2. This returns a mxn matrix where the rows corespond to your X bins, and the columns correspond to your Y bins.
Next, create X and Y matrices, also mxn, using meshgrid.
Finally, create your contour plot.
Here's a rough example using random numbers.
% Create random data
x = (randn(20000,1)*40)+200;
y = abs(randn(20000,1))*20;
plot(x,y,'.')
% Create buns and obtain counts
Xedges=linspace(0,400,51);
Yedges=linspace(0,80,21);
N = histcounts2(x,y,Xedges,Yedges);
% use bin edges to find the center of each bin in X and Y
[X,Y] = meshgrid(mean([Xedges(1:end-1);Xedges(2:end)],1),...
mean([Yedges(1:end-1);Yedges(2:end,1)],1));
% Create countor, transponsing N so rows correspond to Y and columns correspond to X
figure
contourf(X,Y,N',5,"ShowText","on")
8 个评论
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Line Plots 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!