VecNorm

It computes vecnorm for those using matlab version earlier than 2017b

N = vecnorm(A)
N = vecnorm(A,p)
N = vecnorm(A,p,dim)

N = vecnorm(A) returns the 2-norm or Euclidean norm of A:

If A is a vector, then vecnorm returns the norm of the vector.

If A is a matrix, then vecnorm returns the norm of each column.

If A is a multidimensional array, then vecnorm returns the norm along the first array dimension whose size does not equal 1.