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Make distribution visible in scatter plots

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I have two vectors, I3 and D, of the size 1000000x1. They are plotted against each other in a scatter plot (see PIplot1)
I want to know how many values I have. For example If you look to the far right of the figure. I dont know How many values are around y=50 or how many are around y=150.
I need to make the distribution visible somehow, but I do not know how to go about it.
plot(I3,D,'.','Color', [0 0.4470 0.7410]);

Accepted Answer

Adam Danz
Adam Danz on 17 May 2021
Edited: Adam Danz on 17 May 2021
You can display the 2D binned density using histogram2.
Demo: The plot on the left and right contain the same data.
x = 1:105;
ym = randn(800, numel(x)) .* linspace(2,35,numel(x)) + linspace(6,150,numel(x)) ;
xm = repmat(x,size(ym,1),1);
ax(1) = nexttile;
grid on
axis tight
ax(2) = nexttile;
axis tight
cb = colorbar();
ylabel(cb, 'bin count')
Also try setting BinMethod or or bin edges in histogram2.

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