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where the problem .... I want to display the transfer function as a function a ......
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clear all, close all, clc;
syms a
%% State space representation
A = [a 1;-10 -7]
% the state matrix
B = [0;1]
% the input vector
C = [1 0;0 1]
% the output vector
D = zeros(size(C,2),size(B,2))
[num,den]=ss2tf(A,B,C,D)
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Walter Roberson
le 31 Oct 2019
Absolutely nothing in the Control Systems toolbox can handle symbolic variables.
The closest you can get is to construct systems with "tunable" values. Tunable values always have a specific current value; they mostly exist to make it easier to change numeric parameters in state space systems.
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