Magnitude of a vector

syms x y z
r = [x y z]
rmag???

rmag should equal (x^2 + y^2 + z^2)^0.5

[Azzi Abdelmalek]

What is your question?

[Philosophaie]

I am looking for the magnitude of the vector r. It should be equal to r = (x^2 + y^2 + z^2)^0.5.

[Prashant C]

use the function norm(r) or mag=sqrt(sum(r.*r))

[Abdullraheem Diab]

Sqrt(sum(r.^2))

Answer 1

[Shashank Prasanna]

This works perfectly fine on MATLAB R2013a:

>> syms x y z
r = [x y z]; 
norm(r)

http://www.mathworks.com/help/symbolic/norm.html

[Shashank Prasanna]

What version of MATLAB are you using? Can you confirm that you see the file when you run this:

>> which sym/norm

[Bhuvana Krishnaraj]

2015.a version >>which sym/nom C:\matlab\toolbox\symbolic\@!sym\norm.m

Answer 2

[Azzi Abdelmalek]

m=sqrt(x^2+y^2+z^2)

Answer 3

[Tariq Shajahan]

if 'r' is a vector. norm(r), gives the magnitude only if the vector has values. If r is an array of vectors, then the norm does not return the magnitude, rather the norm!!