How to make a heatmap with density of points

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Ángel González 2018-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/415851-how-to-make-a-heatmap-with-density-of-points

评论： Walter Roberson 2020-9-14

Hello!

I have two vectors ( x_vector and y_vector) which correspond with the different points obtained on my simulation. The point is that I want to make a kind of heatmap with the density of the repetition of those points. I have tried with different functions such as imagesc or histogram2, but I didn't get to achieve what I wanted.

Thank you.

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jonas 2018-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/415851-how-to-make-a-heatmap-with-density-of-points#answer_333747

编辑：jonas 2018-8-22

See this thread on density plots using hist3 and contourf

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

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Ángel González 2018-8-30

Ahhhhh okey okey, I didn't know that min(C{2}) meant C{2}(1). I supposed that it would return the minimum value of that array.

Thank you!!

jonas 2018-8-30

编辑：jonas 2018-8-30

Well you were not incorrect, min(C{2}) does not always equal C{2}(1). However, in this specific case C{2}(1) is the minimum value of C{2}. It works both ways.

Sorry for the confusing code ;)

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Walter Roberson 2018-8-22

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https://ww2.mathworks.cn/matlabcentral/answers/415851-how-to-make-a-heatmap-with-density-of-points#answer_333749

https://www.mathworks.com/matlabcentral/answers/224454-creating-a-heatmap-to-visualize-denisity-of-2d-point-data#answer_183261

Or Malcolm's https://www.mathworks.com/matlabcentral/fileexchange/31726-data-density-plot

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Michael King 2020-9-14

Great answer to this question! I'd like to ask a follow up question. Can a number be extracted to indicate the extent of density in a data set? i.e. how focused is a heatmap?