Re: Control Toolbox Function : zpk

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Your Fedora and octave are both old.
If you cannot update those, my only suggestion is to
remove octave-control rpm and install
the control package directly from octave-forge:

octave:1> pkg install -forge control

etc...

Dmitri.
-- 


On Wed, Mar 30, 2022 at 5:59 PM Richard Shadbolt <
[email protected]> wrote:

> Hi Dmitri,
>
> Thanks for the reply.
>
> I am using Fedora 34, Octave is v5.20, Control Toolbox is v3.40
>
> Thanks and regards,
>
> Richard.
> On 30/03/2022 22:46, Dmitri A. Sergatskov wrote:
>
>
>
> On Wed, Mar 30, 2022 at 5:14 PM Richard Shadbolt via Help-octave <
> [email protected]> wrote:
>
>> Hi,
>>
>> I am attempting to use the Control Toolbox function zpk which is stated
>> to have been implemented :
>>
>>
>> https://wiki.octave.org/wiki/index.php?title=Control_package&mobileaction=toggle_view_desktop
>>
>> Yet i am obtaining the error for a basic command :
>>
>>      F=zpk([], [-1 -2 -2], 2);
>>
>> The error is :
>>
>>      error: '__lti_input_idx__' undefined near line 80 column 24
>>
>> I think i am using the correct syntax etc.m for the command. The
>> documentation page indicates that it may not be fully implemented.
>>
>>      https://octave.sourceforge.io/control/function/zpk.html
>>
>> States :
>>
>>      Create transfer function model from zero-pole-gain data. This is
>> just a stop-gap compatibility wrapper since zpk models are not yet
>> implemented.
>>
>> As such, can someone confirm whether the function has or has not been
>> implemented ?
>>
>> Thanks and regards,
>>
>> Richard.
>>
>>
> Something is wrong with your octave installation. What is your OS?
> How did you install  octave and control package?
>
> The command works for me:
>
> octave:1> pkg load control
> octave:2>  F=zpk([], [-1 -2 -2], 2)
>
> Transfer function 'F' from input 'u1' to output ...
>
>                 2
>  y1:  ---------------------
>       s^3 + 5 s^2 + 8 s + 4
>
> Continuous-time model.
>
> Dmitri.
>
> p.s. You probably get more attention to the problem on discourse.
> --
>
>
>
>
>>
>>
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>


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