How can i calculate the distance to all data points?

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Matt
Matt 2012-10-8
I basically want to start at one data point and then calculate the distance to all the other points. Then i want to select the nearest 15. Im not really sure where to start if i'm honest. If someone can point me in the right direction it would be much appreciated

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回答（3 个）

Matt J
Matt J 2012-10-8
Thomas
Thomas 2012-10-8
If you have the statistics toolbox this might help
http://www.mathworks.com/help/stats/pdist.html
There is also a file exchange contribution which might help
http://www.mathworks.com/matlabcentral/fileexchange/71
Azzi Abdelmalek
Azzi Abdelmalek 2012-10-8
f1=@(x,y,x0,y0) sqrt((x-x0).^2+(y-y0).^2)
%how to call f1
x=1:100 % example
y=randi(100,1,100)
x0=x(4); y0=y(4) % start point
dist=f1(x,y,x0,y0)
[out,idx]=sort(dist)
res=out(2:16) % 15 first distances
res_idx=idx(2:16) % corresponding index

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