when i want to get magnitude of vector in command window told me that index exceeds matrix dimensions. although i write true code

v=[1 2 3 9 6]

v = 1x5

1 2 3 9 6

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pp=v.^2

pp = 1x5

1 4 9 81 36

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Rr=sum(pp)

Rr = 131

mag=sqrt(Rr)

mag = 11.4455

disp(mag)

   11.4455

[Torsten]

Your code works as expected (see above).

Answer 1

[Paul]

Code works here

v=[1 2 3 9 6]

v = 1x5

1 2 3 9 6

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

pp=v.^2

pp = 1x5

1 4 9 81 36

<mw-icon class=""></mw-icon>

<mw-icon class=""></mw-icon>

Rr=sum(pp)

Rr = 131

mag=sqrt(Rr)

mag = 11.4455

disp(mag)

   11.4455

Check

norm(v)

ans = 11.4455

Perhaps you have variable(s) named sum or sqrt or disp in your workspace?