MATLAB: How to calculate the magnitude of n-dimensional vector by Matlab’s commands

magnitudevector

Is there any specific command for calculating the magnitude of n-dimensional vector?

I'll assume by "magnitude", you mean the norm. You can just do

norm(x)

but there are different norms with different results

   x = randn(10,1);
   norm(x,2)
   norm(x,1)
   norm(x,inf)

So you have to know which one you want. Just

norm(x)

gives the 2-norm by default.

 x/norm(x,1)

If v is the vector do:

 v = v/norm(v);

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