Euclidean distance between two vectors (single row matrix)

Question

I have two vectors (single row matrices). Assume that we already know the length len.

A = [ x1 x2 x3 x4 x5 .... ]
B = [ y1 y2 y3 y4 y5 .... ]


        

Answer 1

To add to @kol answer,

diff = A - B;
distance = sqrt(sum(diff * diff')) % sum of squared diff

or

distance = norm(A-B);

Answer 2

diff = A - B;
distance = sqrt(diff * diff');

or

distance = norm(A - B);

Answer 3

[val idx]    =  sort(sum(abs(Ti-Qi)./(1+Ti+Qi)));   

or

[val idx]    =  sort(sqrt(sum((Ti-Qi).^2))); 

Val is the value and idx is the original index value of the column being sorted after applying Euclidean distance. (Matlab Code)