Getting error "Subscript indices must either be real positive integers or logical'

I am getting this error when I run the following commands. Help needed at the earliest.

v=[1 -2 3];
n=norm(v);

[Stephan]

Works for me in R2018a:

>> v=[1 -2 3]

v =

     1    -2     3

>> n=norm(v)

n =

    3.7417

Answer 1

[madhan ravi]

See https://www.mathworks.com/matlabcentral/answers/437735-how-to-replace-nan-values-with-zero#answer_354471

It might happen that you have a variable called norm so try the below:

clear all
% or
clear norm
% or
clear norm global
v=[1 -2 3];
n=norm(v);

Also

which norm -all % what shows up

[Sania Gul]

Thank u so much, u r right

[madhan ravi]

Anytime :)