why isnt the function tf working

why isnt the function tf working?

i keep getting error message

[Star Strider]

Post the error message.

Type this:

ver control

in your Command Window and copy and paste the output to a Comment here.

[Minh-Buu Nguyen]

MATLAB Version: 9.8.0.1323502 (R2020a)

MATLAB License Number: xxxxxxxxxx

Operating System: Mac OS X Version: 10.14.6 Build: 18G3020

Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode

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

Warning: No properly formatted Contents.m file was found for 'control'.

> In ver (line 58)

>>

[Ameer Hamza]

Minh-Buu, you don't have Control System Toolbox installed. You need this toolbox to use tf().

[Minh-Buu Nguyen]

how can i install that?

[Star Strider]

That depends on the type of license you have.

What sort of license do you have? Are you using MATLAB as part of a university license or a personal license?

[lounis chehrit]

Just a question is It normal to have a transfer function like this ?

It's definied by :

Real(TF(v)) = cos(2*pi*v).

and phase is 0.

I thing that the parameter s=j*w.

So is It normal to have a real part like this? ( parameter in the cosine)

and how to get transfert function from real and image parts.

Answer 1

[Samatha Aleti]

Hi,

If you have the licensed product “Control Systems Toolbox”, but have not installed yet, you can do as follows:

• Go to MATLAB - > HOME -> Add-Ons -> Get Add-ons -> search for “Control Systems Toolbox” -> click Install

If you do not have the product, then

• you can download the trial version for “Control Systems Toolbox” using this link:https://www.mathworks.com/products/control.html
• Check the Pricing and Licensing details here to purchase

For any support regarding purchase or License contact the sales team:

www.mathworks.com/support/contact_us/

[Laurent Prea]

Thanks. I was looking for the toolbox :)

[Goar Ayrapetyan]

Thank you so much!

[Josue Huerta]

This really helped! Thank you!

[lounis chehrit]

Just a question is It normal to have a transfer function like this ?

It's definied by :

Real(TF(v)) = cos(2*pi*v).

and phase is 0.

I thing that the parameter s=j*w.

So is It normal to have a real part like this? ( parameter in the cosine)

and how to get transfert function from real and image parts.