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How to calculate distance between a set of point to multiple point

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Shin
Shin 2023 年 1 月 10 日
編集済み: Dyuman Joshi 2023 年 1 月 11 日
Hi there, I have two sets of coordinates,
setA = [2,1; 2,3; 4,6];
setB = [8,8; 9,8; 3,7; 5,8; 9,2; 3,4; 5,7];
and I wanted to calculate the distance between the two sets, for example, the first coordinate of "setA" [2,1] to all the coordinates in "setB" and the second coordinate in "setA" [2,3] also with the all in "setB", and so on..., and at the end, i'll have 7 sets of distance calculated in each of the "setA", how can I do it? Thanks.
-Chann-

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Dyuman Joshi
Dyuman Joshi 2023 年 1 月 10 日
編集済み: Dyuman Joshi 2023 年 1 月 11 日
setA = [2,1; 2,3; 4,6];
setB = [8,8; 9,8; 3,7; 5,8; 9,2; 3,4; 5,7];
%single element
dist=vecnorm(setB-setA(1,:),2,2)
dist = 7×1
9.2195 9.8995 6.0828 7.6158 7.0711 3.1623 6.7082
%for all the points in setA
s=size(setA,1);
%pre-allocation
y=cell(1,s);
for idx=1:s
y{1,idx}=vecnorm(setB-setA(idx,:),2,2);
end
y
y = 1×3 cell array
{7×1 double} {7×1 double} {7×1 double}
%you can compare the values to the above result for reference
y{1}
ans = 7×1
9.2195 9.8995 6.0828 7.6158 7.0711 3.1623 6.7082
Here, y{1} will correspond to distances of 1st point of setA to all points of setB
y{2} for 2nd point of setA to all points of setB
and y{3} for 3rd point of setA to all points of setB
  2 件のコメント
Shin
Shin 2023 年 1 月 10 日
Hi Dyuman Joshi, thanks for the fast reply, the code works as I wish, thanks a lot, appreciate it .
Dyuman Joshi
Dyuman Joshi 2023 年 1 月 10 日
You are welcome!

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