How to count number of points in a volumetric grid (4D histogram)?

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Itzik Ben Shabat 2016-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/302193-how-to-count-number-of-points-in-a-volumetric-grid-4d-histogram

评论： Jesse Ivers 2023-10-12

Hi, I have 3D point data in XYZ and i wish to creat a 4D histogram, i.e. a 3D matrix containing the point count in a volumetric lattice. now, i know how to do it using a ton of for loops but the question is what is th good implementation for this ? btw i found this : https://www.mathworks.com/matlabcentral/fileexchange/23897-n-dimensional-histogram

However it uses histc (which i saw is not recommended) and it gives me a strange result (for some unkown reason it adds a bin in one of the dimensions) Thanks, Itzik

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Mikk Laanes 2020-10-27

Could you share how you made the referenced code to work in 3D? It appears to only accept M-by-N matrices?

Jesse Ivers 2023-10-12

@Mikk Laanes It is set up so that you have M data points from each dimension and N dimensions. Each column (1:N) will be considered as a seperate vector of data, so if you have 50 3D data points, you will have 3 columns with 50 values each. Your input will never be greater than 2D, but it can represent ND data by simply increasing columns. Hope this helps.

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