Using pdist with two matrix's

Hi,

So if I have one 102x2 matrix of x,y coordinates, and another 102x2 matrix of x,y coordinates, can pdist be used to compare all the rows in matrix 1 with the rows in matrix 2? As in for matrix one row 1, the x,y coordinates are compared to matrix 2 row 1 x,y coordinates; row 2 mat1 is compared to row 2 mat2 etc to find the distance between them, for all 102 rows?

I want to find their distances but I can't quite understand the help page on pdist, can it be used for this or is there another function I should look at?

Many thanks!

Answer 1

[Image Analyst]

Use pdist2()

distances = pdist2(xySet1, xySet2);

[Mia]

I tried this and got a 102x102 size matrix when I just want the distances between the first xy set and second xy set, like below

xy1 xy2 distances

1,2 1,4 2

1,3 1,3 0 etc

Which would be a 102x1 matrix, how can I get this? Thank you!

[Image Analyst]

Then just use sqrt():

distances = sqrt((xy1(:, 1) - xy2(:, 1)) .^ 2 + (xy1(:, 2) - xy2(:, 2)) .^ 2)

Basically it's just distances = sqrt(deltax^2 + deltay^2)

[Mia]

Perfect, thank you so much!! Have a lovely day <3