Question

How do I find the magnitude of a vector?

Answer 1

The magnitude of a vector in `RR^n` (if you're using dot product as inner product) is given by the square-root of the sum of the square of each coordinate of the vector.

Let `v = [v_1,v_2,v_3,v_4]`:
The magnitude of `v` is `sqrt((v_1)^2+(v_2)^2+(v_3)^2+(v_4)^2)`//

For a more general `RR^n` vector `u = [u_1,u_2,...,u_n]`, its magnitude is given by `sqrt((u_1)^2+(u_2)^2+...+(u_n)^2)`//

Hope it helps