Re: rlocus

[A. Scottedward Hodel]

I think someone already gave this answer, but FYI: rlocus was  
significantly updated between 2.1.73 and 2.9.x.  If I recall, the  
2.1.73 version doesn't work properly if the transfer function has no  
zeros, which is your situation.

On Jun 21, 2007, at 11:19 AM, Eduardo Adam wrote:

> Hi everyone,
>
> I'm sorry for this basic question but I'm a new octave user and, I'm
> accustumed to used matlab.  So, I ran the following comands:
>
> octave:1> n=1; d=[1 3 2 0];
> octave:2> [ro,Kr]=rlocus(tf(n,d),0.1,0,10)
> warning: in /usr/share/octave/2.1.73/m/control/base/rlocus.m near  
> line 3,
> column 8:
> warning: rlocus: some elements in list of return values are undefined
> ro = [](0x0)
> Kr =
>
>   -0.38490
>    0.38490
>
>
> My question is, why I have the answer ro=[]?
> I'm interested in the closed loop roots and, according to the help,  
> rlocus
> would have to provide the roots
>
> On the other hand, the comand
> octave:3> rlocus(tf(n,d),0.1,0,10)
>
> it works perfectly.
> My octave version is 2.1.73 and I'm working with linux-kubuntu.
>
>
> Thanks to everyone.
>
> Eduardo
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