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Re: Error with tf(): # of poles < # of zeros


From: Doug Stewart
Subject: Re: Error with tf(): # of poles < # of zeros
Date: Thu, 25 Mar 2010 22:43:39 -0400



On Thu, Mar 25, 2010 at 9:48 PM, Axax <address@hidden> wrote:
Hi,
I'm trying to defina a system with the function tf() but I got this
error:

octave:49> tf([1 0.8],[1])
error: # of poles (0) < # of zeros (1)

I can't understand why I can't define a system with a zero only!
There are some reasons for that?
Thanks for the help
Axel


One more point.  I believe that you are trying to do a "non-causal" system. You are trying to model a system that has an output before the input arrives.

Now if we can do that we will know the future!!!!
Doug
 

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