Calculating the differences between XY pairs in a matrix

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Naruto
Naruto 2020-11-8
评论： Matt J 2020-11-10
Hello friends,
I have this mega matrix (1000:4) with observations that has 0 and 1 on the last column.
The second and third column contains the observations' x,y coordinates in m distance. I want to create a condition where it can output the rows that include 0, satisfy the condition that the measured distance between an observation of 0 and 1 that were less than 5m and then count the no. of observations that satisfied both conditions.
How could I list them out? I realise that the essential functions that I can use could be for loop, count and else if.
Thanks.

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Matt J
Matt J 2020-11-8
xy=M1(:,2:3);
b=M1(:,4);
A=xy(:,b==0);
B=xy(:,b==1);
tf = any(pdist2(A,B)<=5,2);
result=A(tf,:);

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