How to obtain complexity cosine similarity in Matlab?

How to obtain complexity cosine similarity in Matlab?

I have implemented cosine similarity in Matlab like this. In fact, I have
a two-dimensional 50-by-50 matrix. To obtain a cosine should I compare
items in a line by line form.
for j = 1:50
x = dat(j,:);
for i = j+1:50
y = dat(i,:);
c = dot(x,y);
sim = c/(norm(x,2)*norm(y,2));
end
end
Is this correct? The question is this: wath is the complexity or O(n) in
this state?