MATLAB: Euclidean distance of two vectors

Question

Euclidean distance of two vector. I have the two image values G=[1×72] and G1 = [1×72]. I need to calculate the two image distance value.

Answer 1

Do you know the definition of the Euclidean distance?

G  = rand(1, 72);
G2 = rand(1, 72);
D  = sqrt(sum((G - G2) .^ 2));

A more efficient method, but this matters only for much larger vectors:

V = G - G2;
D = sqrt(V * V');

Or a Matlab command:

D = norm(G - G2);

A fast C-Mex function: http://www.mathworks.com/matlabcentral/fileexchange/29035-dnorm2

D = DNorm2(G - G2);

Searching in the documentation is faster than waiting for an answer in the forum. Therefore it is recommended to let Matlab search for the wanted keyword at first:

docsearch euclidean