how to calculate distance of points

Question

NORLENDA 2013-7-16

Hi, leenda here. I am new to this programming thingy.

I have a set of 150 data containing values of (xi,yi). How to I find the distance of these data and tabulate the distance in a matrix.

Example:

I have points P1, P2, ... P150.

How do I calculate the distance of P1 to P2, P1 to P3, P1 to P4 , etc ...

Thanks a lot. Your help is much appreciated.

Answer 1

Andrei Bobrov 2013-7-16

编辑：Andrei Bobrov 2013-7-16

P - your data containing values of (xi,yi). < 150 x 2 double >

P = randi(250,150,2); % eg
out = pdist(P);

in table form:

out = squereform(pdist(P));

OR

outtableform = squeeze(sqrt(sum(bsxfun(@minus,P,permute(P,[3 2 1])).^2,2)));
outvectorform = nonzeros(tril(outtableform));

NORLENDA 2013-7-17

Thank you very much ... :-) ...