Count number of particles within a given radius

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Alakesh Upadhyaya 2022-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/1706965-count-number-of-particles-within-a-given-radius

评论： Image Analyst 2022-4-28

采纳的回答： KSSV

I have a question regarding counting number of particles.

Lets say:

I create a box of domain 100x100 units.
I put 10000 random particles inside the box by using rand command.

Now what I want is the following:

I want to count the number of neighbour particles of each particle within radius 1 units. i.e each of my particles of 10000 random particles only interact with their neighbour who's distance is = or < 1.

Can anyone help !

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Alakesh Upadhyaya 2022-4-28

No, I have an output of a simulation. The simulation contains particles of 2 types, type 1 and type 2. The file has following columns:

particle id particletype x-pos y-pos. Now I want to find all the neighbours of type 2 particles within radius 1 of each particles.

Image Analyst 2022-4-28

OK so you have the location of each particle, but do you have its radius? Or did you mean distance to other nearest particle instead of radius?

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KSSV 2022-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/1706965-count-number-of-particles-within-a-given-radius#answer_952680

REad about knnsearch, rangesearch and inpolygon.

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Alakesh Upadhyaya 2022-4-28

Thank you, I did it using rangesearch.

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MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

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