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');
- 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
