How to improve the distance calculation on two separated datasets

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amj 2018-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/384627-how-to-improve-the-distance-calculation-on-two-separated-datasets

编辑： amj 2018-2-25

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Hi,

Can anyone advice me on how to improve the distance calculation on the 2 separated datasets? My Data:

X = [   3.6  79
        1.8  54
        3.333  74
        2.283  62
        4.533  85
        2.883  55
        4.7  88
        3.6  85
        1.95  51
        4.35  85
        1.833  54
        3.917  84
        4.2  78
        1.75  47
        4.7  83
        2.167  52
        1.75  62
        4.8  84
        1.6  52
        4.25  79
        1.8  51
        1.75  47
        3.45  78
        3.067  69
        4.533  74
        3.6  83
        1.967  55
        4.083  76
        3.85  78
        4.433  79
        4.3  73
        4.467  77
        3.367  66
        4.033  80
        3.833  74
        2.017  52
        1.867  48
        4.833  80
        1.833  59
        4.783  90  ]
    clc;  
    close all; 
    figure;
    h(1) = plot(X(:,1),X(:,2),'bx');
    hold on;
    X1 = X(1:3,:);
    X2 = X(4:40,:);
    h(2) = plot(X1(1:3,1), X1(1:3,2),'rs','MarkerSize',10);
    k=5;
    [D2 ind] = sort(squeeze(sqrt(sum(bsxfun(@minus,X2,permute(X1,[3 2 1])).^2,2))))
    ind_closest = ind(1:k,:)
    x_closest = X(ind_closest,:)
    for j = 1:length(x_closest);
        h(3) =plot(x_closest(j,1),x_closest(j,2),'ko','MarkerSize',10);
    end