How to measure the shortest distance among different points using Matlab

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M.S. Khan
M.S. Khan 2020-10-27
评论： Jakob 2021-3-10
Lets suppoese i have the points as shown by B. For example, P1(1,1,2 ), P2(1,2,3 ) etc as shown by B. I want to measure the shortest distance among these points.
x = B(:,1), y =B(:,2) and z = B(:,3).
Thanks in advance for support from community members. Regards!
B =
1 1 3
1 2 3
2 3 1
2 3 2
3 1 1
3 3 1
3 3 2
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M.S. Khan
M.S. Khan 2020-10-28
Dear KSSV, i am trying to understand its documentation and then will apply. Thanks for your guidance. Regards!

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回答（1 个）

Jakob
Jakob 2020-10-28
B = randi([-10 10],5,3); % just some random numbers
minimum = sqrt(sum((B(1,:)- B(2,:)).^2));
for i = 1 : size(B,1)-1
for j = i+1 : size(B,1)
minimum = min(minimum,sqrt(sum((B(i,:)- B(j,:)).^2)));
end
end
disp(minimum)
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M.S. Khan
M.S. Khan 2020-10-29
Thanks KSSV, pdist() functions works. Thanks for reply Dear Jakob. your code and pdist() function works same.
Jakob
Jakob 2021-3-10
Hi again, sorry I can't reply in private to your email.
About your question:. "I think pdist2() can only be used for 2D, right.".
Be careful, pdist2() works different then pdist(), you can safely use
min(pdist(YOURMATRIX))
to measure the minimal distance for any dimension. It's basically the same as my code

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