Recently, I got a Matlab licence (individual academic use license) for Mac 10.15.1. I tried to find the Lypunov solution but it shows an error'' 'lyap' requires control system toolbox'? what is it and how to resolve that.
The Control System Toolbox is a piece of software that can be purchased along with MATLAB. This toolbox contains functions and apps related to Control Systems which The MathWorks sells. Check out more details at https://www.mathworks.com/products/control.html
You can download a free version or contact sales to make a purchase. Link to sales is also available on the same page.