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histogram2 configuration for colorbar and frenquency of cells

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Hello, how can i do this in matlab? Put the frenquency and the colours as the colorbar.

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Accepted Answer

breathi
breathi on 5 Dec 2019
Hi,
try somethings like this when using histogram2
% Your data
data.X = randn(1,10000).*2+10;
data.Y = randn(1,10000)+6;
data.XEdges = 0:1:20;
data.YEdges = 0:12;
% Data counting number of occurencies
h=histogram2(data.X,data.Y ,data.XEdges, data.YEdges,'FaceColor','flat','EdgeColor','none');
% Modifying colormap with a bit of white at the end
cb = colorbar;
p=colormap('jet');
p(1:7,1:3) = [linspace(1,0,7)',linspace(1,0,7)',ones(7,1)];
colormap(p);
cb.Label.String = 'ColorBarString';
% Some labels
xlabel('X')
ylabel('Y')
zlabel('Enumeration of occurencies')
% create text labels from histcounts2
N = histcounts2(data.X,data.Y,data.XEdges,data.YEdges);
for xi=1:size(N,1)
for yi=1:size(N,2)
if N(xi,yi) > 0
text(mean(data.XEdges(xi:xi+1)), mean(data.YEdges(yi:yi+1)), num2str(N(xi,yi)), 'HorizontalAlignment', 'center', 'VerticalAlignment', 'middle');
end
end
end
h.FaceAlpha = .5;
% plot some curves at bottom
hold on,
plot(1:20,1:20)
% change view to 2D from below (to see texts & plots)
view(0,-90)
% reverse YDir
h.Parent.YDir = 'reverse';
Alternatively you could use other plot commands like bar3, ...
This should help you going where you want.

  2 Comments

Felipe Aranda Delgado
Felipe Aranda Delgado on 6 Dec 2019
Hey! it works. But i want a blur effect on the edge of the bins . Do you know how to do that?
breathi
breathi on 9 Dec 2019
I'm not sure, you can try using something like this for a histogram2:
h.EdgeColor = 'k'
h.LineWidth = 4
h.EdgeAlpha = 0.1
But then the colors form the colorbar are obviously not applied as the borders. I could imagine that the colors are plotted by hand and the colorbar is just a dummy then.
But maybe someone else can help out here.

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