Error unrecognised function or Variable 'ss'

Hello

I am trying to use the state space model in my MATLAB code, however my Matlab is not recognising it and giving me always the error. I am using R2020a Student Version on Mac Pc.

My Error:

Unrecognized function or variable 'ss'.

Error in ex_2 (line 16)

sys1 = ss(-1/(R*C), 1/(R*C), 1, 0);

My Code:

figure('Name', 'Exercise e)', 'NumberTitle', 'off');

%%Setting arguments and values 

R = 1000;
C = 0.001;
L = 100;

%%Establishing matrixes for later use

matrix1 = [0, -1/(L*C); 1, -R/L];
matrix2 = [1, 0];
matrix3 = [0, 1/(L*C)];

%%Creating the functions of the graphs
sys1 = ss(-1/(R*C), 1/(R*C), 1, 0);
sys2 = ss(matrix1, matrix2, matrix3, 0);

%%Drawing the graphs on the same figure
subplot(2,1,1);
impulse(sys1, sys2);
subplot(2,1,2);
step(sys1, sys2);

[Walter Roberson]

need the Control System Toolbox to be licensed and installed

[Syed Ghayyour Ahmed]

Can you please tell me which tool is that exactly ?

[Syed Ghayyour Ahmed]

Thank you very much. My Problem is solved by downloading Control System Tool Box.

[BAKARI Aymen]

i have the same problem !

could you please told me how can i install the control system toolbox

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/101885-how-do-i-install-additional-toolboxes-into-an-existing-installation-of-matlab

and in particular my Answer there

Answer 1

[Arkadiy Turevskiy]

This question gets a lot of views, so summarizing the answer: this error is due to Control System Toolbox not being installed.

[Harsh Jaiswal]

Hi,

I actually have it installed and still get the error. I dont know what could be wrong.

[Arkadiy Turevskiy]

Hi, sorry to hear you are having issues.

Can you please post the code that is creating the error. Please also type "ver" at the command line and post the resulting list of products.

>>ver

If you are uncomfortable sharing the code, please contact MathWorks technical support.

Arkadiy

[Dániel]

restarting matlab worked for me