Find one-to-one correspondence with "knnsearch" function
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Hey everyone!
Is it possible to use the function Idx = knnsearch(X,Y) in order to get a one-to-one correspondence between X and Y? I would like to exclude all values that have been already matched with the nearest neighbor in Idx. If it's not, do you know another way to do that?
Thank you in advance.
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Hrishikesh Borate
2021-2-4
Hi,
I understand that you are trying to find one to one correspondence between X and Y. One approach to find it using knnsearch is:-
load hospital;
X = [hospital.Age hospital.Weight];
tempX = X;
Y = [20 162; 30 169; 40 168; 50 170; 60 171];
for i=1:size(Y,1)
Idx = knnsearch(X,Y(i,:));
tempX(Idx,:) = inf;
id(i) = Idx;
end
load hospital;
X = [hospital.Age hospital.Weight];
Y = [20 162; 30 169; 40 168; 50 170; 60 171];
D = pdist2(X,Y);
[D,I] = sort(D);
temp = zeros(size(D,1),1);
id = zeros(size(D,2),1);
for i=1:size(D,2)
count = 1;
while(temp(I(count,i))~=1 || id(i)==0)
if temp(I(count,i))==0
temp(I(count,i)) = 1;
id(i) = I(count,i);
else
count = count+1;
end
end
end
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