Find distances between all points

Hi,

I have four landmarks which are A,B,C,D

These landmarks have the coordinates in x,y vectors respectively:

x = [1, 2, 3, 4] y = [1, 3, 4, 3]

Now I want to find the distance (using distance formula for two points) between all the points but avoid repetition. So for example I want to find the distances:

AB/AC/AD/BC/BD/CD

Any help is appreciated thanks.

Answer 1

[Image Analyst]

Can I assume you tried the obvious, simple, straightforward, intuitive brute force approach?

x = [1, 2, 3, 4];
y = [1, 3, 4, 3]
for xIndex = 1 : length(x)
  for yIndex = xIndex : length(y)
    distances(xIndex, yIndex) = sqrt((x(xIndex)-x(yIndex))^2 + (y(xIndex)-y(yIndex))^2)
  end
end
distances  % Report to the command window.

If you already tried this obvious brute force approach and didn't like it for some reason then say what's wrong with it?

[Isuru]

Thanks. I managed to use pdist(X) instead. Thanks for the reply anyway.