zpk function for atlab R2020b

Hey,

I tried to use the function 'zpk' (https://www.mathworks.com/help/control/ref/zpk.html) but got the following error:

"Unrecognized function or variable 'zpk'"

I work with Matlab 2020b and tried to run the code from the reference:

zeros = 0;

poles = [1-1i 1+1i 2];

gain = -2;

sys = zpk(zeros,poles,gain)

Am i doing something wrong?

Thanks

Answer 1

[Anshika Chourasia]

Hi,

Function "zpk” is implemented in Control System Toolbox. Before moving forward, please check and verify the installation of CST toolbox.