Magnitude of a vector

Asked by Philosophaie on 5 Sep 2013

Latest activity Commented on by Abdullraheem Diab on 30 Jun 2019

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

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

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Philosophaie on 5 Sep 2013

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 on 3 Jun 2015

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

Abdullraheem Diab on 30 Jun 2019

Sqrt(sum(r.^2))

3 Answers

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Answer by Shashank Prasanna on 5 Sep 2013

Edited by MathWorks Support Team on 22 May 2019

Accepted Answer

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

2 Comments

Shashank Prasanna on 5 Sep 2013

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

>> which sym/norm

Bhuvana Krishnaraj on 3 Jun 2019

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

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Answer by Azzi Abdelmalek on 5 Sep 2013

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

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Answer by Tariq Shajahan on 11 May 2015

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!!

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