how to plot contour lines on Joint Histogram plot

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UTKARSH VERMA
UTKARSH VERMA 2021-2-25
评论： Cris LaPierre 2021-3-7
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]
And, The kind of figure I want should look like(plotted in Rstudio):
Thanks,
Utkarsh
  2 个评论
Cris LaPierre
Cris LaPierre 2021-3-6
If you share your data, we can probably be more helpful.
UTKARSH VERMA
UTKARSH VERMA 2021-3-6
Hi Cris,
Here is the data which I used to plot above histogram plot.
Note:- On the x axis "noaa_olr_dly_1985_2014_AI_grid_masked_JJAS.nc" data is plotted and on the y axis "rf_daily_1985_2014_grid_JJAS.nc" is plotted.
https://drive.google.com/drive/folders/1VJSlRG8ldh_Nh7Nx0hSDs1wVl7wGGghn?usp=sharing

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Cris LaPierre
Cris LaPierre 2021-3-6
编辑：Cris LaPierre 2021-3-6
Ran in:
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")
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UTKARSH VERMA
UTKARSH VERMA 2021-3-6
Yes y-axis shows 75 max value but according to contour graph it appears no data or constant beyond 15 whatever way it doesn't make sense according to data. If you look at the Matlab plot through histogram2, I need more contour to separate out density to higher y axis values

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