Error unrecognised function or Variable 'ss'

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Syed Ghayyour Ahmed on 3 May 2020

Commented: Arkadiy Turevskiy on 1 Mar 2021

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);