Count number of particles within a given radius

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Alakesh Upadhyaya
Alakesh Upadhyaya 2022-4-28
评论： Image Analyst 2022-4-28
I have a question regarding counting number of particles.
Lets say:
  1. I create a box of domain 100x100 units.
  2. 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
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
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
KSSV 2022-4-28
REad about knnsearch, rangesearch and inpolygon.

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