MATLAB: What mean l2 norm?

MATLAB

what mean l2 norm??

The l2 norm of a vector is the square root of the sum of the absolute values squared

X = randn(8,1);
norm(X,2)

The above is equal to

sqrt(sum(abs(X).^2))

 x/norm(x,1)

If v is the vector do:

 v = v/norm(v);

(The 'norm' function gives L2 norm as a default.)