Why the syms command is not working on my matlab?

when entering the syms command to define variables, an error occurs that says undefined function.

Answer 1

[Walter Roberson]

syms is part of the Symbolic Toolbox. The Symbolic Toolbox is an optional, extra-cost toolbox for the Academic license and the Professional license. The Symbolic Toolbox is included in the Student Version, but it is not installed by default.

[Elie Saikaly]

Thank you for your answer, but what shall I do in order to install this toolbox?

[Walter Roberson]

Go into the installer and select the products you want to install.

[Eirini Gk]

Is there a different way to create symbolic functions and variables without this installation?

[Walter Roberson]

Yes, you could install Maplesoft's Maple product, which will give you an option to install the Maple Toolbox, which will give you an interface to the Maple symbolic engine from MATLAB. This is a third-party product with whatever costs Maplesoft may choose to charge. The original MATLAB Symbolic Toolbox and Extended Symbolic Toolbox were Maple; current versions of the MATLAB Symbolic Toolbox are based upon the Mathworks-owned MuPAD symbolic engine.

[Eirini Gk]

oook..so i think the first option was better. Thank you.

[Deepak D Pai]

how can i install it?

[Walter Roberson]

The Symbolic Toolbox is bundled with the Student Suite, but is extra cost for everyone else. Once you have a license for it, you can use the MATLAB installer, or you can (last several years) use the Add-On Explorer to install it.

[Abdelqader]

how i answer this question in mat lab

Solve the following system of simultaneous equations for x:

-2.0 x1 + 5.0 x2 + 2.0 x3 + 3.0 x4 + 4.0 x5 - 1.0 x6 = -3.0
2.0 x1 - 1.0 x2 - 5.0 x3 - 2.0 x4 + 6.0 x5 + 4.0 x6 = 1.0
-1.0 x1 + 6.0 x2 - 4.0 x3 - 5.0 x4 + 3.0 x5 - 1.0 x6 = -6.0
4.0 x1 + 3.0 x2 - 6.0 x3 - 5.0 x4 - 2.0 x5 - 2.0 x6 = 10.0
-3.0 x1 + 6.0 x2 + 4.0 x3 + 2.0 x4 - 5.0 x5 + 4.0 x6 = -6.0
2.0 x1 + 4.0 x2 + 4.0 x3 + 4.0 x4 + 5.0 x5 - 4.0 x6 = -2.0

[Walter Roberson]

syms x1 x2 x3 x4 x5 x6
eqns = [
-2.0*x1 + 5.0*x2 + 2.0*x3 + 3.0*x4 + 4.0*x5 - 1.0*x6 == -3.0
2.0*x1 - 1.0*x2 - 5.0*x3 - 2.0*x4 + 6.0*x5 + 4.0*x6 == 1.0
-1.0*x1 + 6.0*x2 - 4.0*x3 - 5.0*x4 + 3.0*x5 - 1.0*x6 == -6.0
4.0*x1 + 3.0*x2 - 6.0*x3 - 5.0*x4 - 2.0*x5 - 2.0*x6 == 10.0
-3.0*x1 + 6.0*x2 + 4.0*x3 + 2.0*x4 - 5.0*x5 + 4.0*x6 == -6.0
2.0*x1 + 4.0*x2 + 4.0*x3 + 4.0*x4 + 5.0*x5 - 4.0*x6 == -2.0]

eqns = 

[A,b] = equationsToMatrix(eqns)

A = 

b = 

A\b

ans =