changing continuous transfer function

Hi Every one,

I have a continuous trnsfer function and I want autimatically shift all s values by a value as w.

For example if I have the following transfer function

s=tf('s')

H=1/(0.002*s+10);

I want to obtain H(s+w) as H(s+w)=1/(0.002*(s+w)+10)

For this transfer function I can easily subtitute s with s+w but if the transfer function is long with multiple coefficents it is not an effective way. So Im wondering if there is a way so that I can autoimatically shift all s values?

Thanks

Answer 1

[Mohammad Sami]

You should just define your transfer function as a function. You can then just pass in the values you want to evaluate on.

H = @(s)1/(0.002*s+10);
s = 10;
w = 2;
Hsw = H(s+w);

Answer 2

[Mohammad mahdavyfakhr]

Yes, thank you, this works when I first define a transfer function, but in case the transfer function is obtained from other code like:

H=@(s) tf([1],[1 1]);

w = 2;

we cannot have H(s+w) right.