How to show TF function in GUI text box

Question

RJS 2021-8-7

回答： Walter Roberson 2021-8-7

s = tf('s');

Gc =(s+1/T)/(s+1/(beta*T));

set(handles.TF,'string',Gc);

it showing some error

Answer 1

Walter Roberson 2021-8-7

s = tf('s');
T = randi([2 20])
T = 4
beta = rand()
beta = 0.0620
Gc =(s+1/T)/(s+1/(beta*T));

then

Gcstr = "(" + strtrim(poly2str(Gc.num{1}, 's')) + ")/(" + strtrim(poly2str(Gc.den{1}, 's')) + ")"
Gcstr = "(s + 0.25)/(s + 4.0313)"

If you have the Symbolic Toolbox you could also do

Gcstr = string(vpa(poly2sym(Gc.num, sym('s')) / poly2sym(Gc.den, sym('s')),5))
Gcstr = "(s + 0.25)/(s + 4.0313)"

After you have Gcstr created you can set the String property of your field to Gcstr .