my matlab does not recognize the function sym. how can I solve this problem?

my matlab does not recognize the function sym:

sym x; f=3*x

??? Undefined function or method 'sym' for input arguments of type 'char'.

Error in ==> Untitled at 1 sym x;

how can I solve this problem?

Answer 1

[Babak]

you need to purchase the Symbolic Math Toolbox.

You probably don't have it.

check

syms x;

[Babak]

run this in the command window:

 >> ver

you'll see the toolboxes you are licensed to use.

[Walter Roberson]

The Symbolic Math Toolbox is extra cost in every MATLAB -except- the Student Version, but in the Student Version it is not necessarily installed by default.