Tf Function keeps running

Hello, I've a problem with the use of the tf function. Basically i try to build a tf function using ( s = tf('s') ) and then writing my function. It works only with few poles and zeros (it seems just a total of 4), but when i try to write a function with more poles and zeros, and then i try to run it, it just keeps running. Any solution to this problem?

[Sam Chak]

@Alessandro Romeo

Can you show the code for troubleshooting purposes?

[Alessandro Romeo]

s=tf('s')

g=100*(s+10)*(s-5)/(s*(s+8)*(s^2+s+1)*(s-5))

Here it is.

[Sam Chak]

Is this result expected?

g =

100 s^2 + 500 s - 5000

------------------------------------

s^5 + 4 s^4 - 36 s^3 - 37 s^2 - 40 s

Continuous-time transfer function.

[Alessandro Romeo]

Yes, but I don't know why my code keeps running, so it doesn't show me the result.

[Sam Chak]

Try clear everything and see if the problem persists.

clear all

[Alessandro Romeo]

Oh WOW, finally it runs correctly! Thank you very much!

Answer 1

[Sam Chak]

@Alessandro Romeo

I'm glad that the proposed solution works. Just keep in mind that you don't have to clear all every time. You can first check if there is another variable named 's' in the Workspace.

clear all
s = tf('s')
g = 100*(s+10)*(s-5)/(s*(s+8)*(s^2+s+1)*(s-5))

[Alessandro Romeo]

Oh, I didn't think about that. I will pay attention to this one. Thank you.