This example shows how to create the low-pass filter F = a/(s + a) with one tunable parameter a.
You cannot use ltiblock.tf to represent F, because the numerator and denominator coefficients of an ltiblock.tf block are independent. Instead, construct F using the tunable real parameter object realp.
Create a tunable real parameter.
a = realp('a',10);
The realp object a is a tunable parameter with initial value 10.
Use tf to create the tunable filter F:
F = tf(a,[1 a]);
F is a genss object which has the tunable parameter a in its Blocks property. You can connect F with other tunable or numeric models to create more complex models of control systems. For an example, see Control System with Tunable Components.