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From: Jeffrey Wurtz on 10 Aug 2010 12:19
Two coworkers using MATLAB version 2008 have the function named "FRF".

I have the 2009a version and when I type "help frf" I get the following message:
"frf not found."

Does anyone know what happened to the "frf" function?
Can someone please tell me how to get the "frf" function?
From: Wayne King on 10 Aug 2010 12:50
"Jeffrey Wurtz" <jeff.wurtz(a)lmco.com> wrote in message <i3ru5o$ho6$1(a)fred.mathworks.com>...
> Two coworkers using MATLAB version 2008 have the function named "FRF".
>
> I have the 2009a version and when I type "help frf" I get the following message:
> "frf not found."
>
> Does anyone know what happened to the "frf" function?
> Can someone please tell me how to get the "frf" function?

Hi Jeffrey, frf is not a Mathworks' function, so your co-workers must have obtained it from somewhere else. There are many ways of obtaining a frequency response (I'm assuming that frf stands for frequency response function) with Mathworks' functions/objects.

Do you have the coefficients of a difference equation? How are you defining your system?

If the frf code your co-workers have is distributed under an open source license, perhaps they can share it with you.

If you want to estimate the frequency response using Mathworks' functions/objects, write back and tell us what toolboxes you have and what kind of system you are attempting to estimate the frequency response of.

Wayne
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