MATLAB: Visualizing density of points

densityheat map

I have a matrix A with dimension of 288*15581 where 288 is the length of time. Hence, I have 15581 curves. when I plot them I have the picture attached.

The problem is I do not know how many point have been gathered at one specific location. Having A, how can I see the density of points? I think heat map can do it but I have no idea.

Best Answer

You can probably use hist3. See some similar questions here:

https://se.mathworks.com/matlabcentral/answers/415851-how-to-make-a-heatmap-with-density-of-points

https://se.mathworks.com/matlabcentral/answers/409660-can-i-use-contourf-with-two-matrices

Upload some data if you need code.

Related Solutions

MATLAB: How to find the point where most lines intersect in a binary image

A good solution would be to identify each line by e.g. Hough transform, determine each intersection (e.g. InterX ) and then find the cluster with the highest density of intersections using e.g hist3.

In this case, it seems the point of interest is also the point with the highest density of white pixels, so you could apply some smoothing filter and then find the highest value in the matrix. Here's an example using a very simple 10x10 pixel average.

w=ones(10,10);
A=conv2(I,w/numel(w),'same') 
imagesc(A)
colormap(gca,'jet')

MATLAB: How to plot point with marker like a dart

See

doc feather

Best Answer

Related Solutions

MATLAB: How to find the point where most lines intersect in a binary image

MATLAB: How to plot point with marker like a dart

Related Question