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Counting number of individuals between a box

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Jonathan Demmer
Jonathan Demmer 2020-7-27
回答： Star Strider 2020-7-27
Hello,
I have 7000 particles scattered in an area. I would like to count the number of them in one particular area delimited by fixed coordinates. For example:
Particles number Coordinates X Coordinates Y
1 25 58
2 18 30
3 5 45
4 26 60
5 27 61
6 14 70
How many particles are located in the area: 20<x<30 and 57<y<71? The aswer should be: 3
Thank you for your help.
Jonathan

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回答（1 个）

Star Strider
Star Strider 2020-7-27
Try this:
A = [1 25 58
2 18 30
3 5 45
4 26 60
5 27 61
6 14 70];
Count = nnz(A(:,2)>20 & A(:,2)<30 & A(:,3)>57 & A(:,3)<71)
producing:
Count =
3
.

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