how to plot contour lines on Joint Histogram plot
조회 수: 39 (최근 30일)
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:
Yedges = [0.25:.25:100];
Xedges = [50:2.5:350];
And, The kind of figure I want should look like(plotted in Rstudio):
Cris LaPierre 2021년 3월 6일
편집: Cris LaPierre 님. 2021년 3월 6일
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;
% Create buns and obtain counts
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),...
% Create countor, transponsing N so rows correspond to Y and columns correspond to X