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Re: c2d is a Stub that only Produces Error Messages


From: Lukas Reichlin
Subject: Re: c2d is a Stub that only Produces Error Messages
Date: Tue, 22 Feb 2011 13:04:00 +0100

On 22.02.2011, at 05:59, Thomas D. Dean wrote:

> Octave 3.4.0, control 2.0.0
>> From the Converting from S to Z domain thread,
> 
> octave:1> num = [1 0];den = [1 0 4];
> octave:2> sys = tf(num, den,1);sysz=c2d(sys,1);sysout(sysz,'tf')
> error: tf: c2d: not implemented yet
> error: called from:
> error:   /home/tomdean/octave/control-2.0.0/@tf/__c2d__.m at line 31,
>         column 7
> error:   /home/tomdean/octave/control-2.0.0/@lti/c2d.m at line 46,
>         column 7
> 
> Looks like __c2d__ is a stub that only displays error messages, either
> "not implemented" or "invalid method".
> 
> # cat /home/tomdean/octave/control-2.0.0/@tf/__c2d__.m
> ...<snip>
> function sys = __c2d__ (sys, tsam, method = "zoh")
> 
>  [p, m] = size (sys);
> 
>  switch (method)
>    case {"zoh", "std"}
>      error ("tf: c2d: not implemented yet");
> 
>    otherwise
>      error ("tf: c2d: %s is an invalid method", method);
> 
>  endswitch
> 
> endfunction
> 
> tomdean

Yes, @tf/__c2d__.m is only a stub right now.  @ss/__c2d__.m offers zero-order 
hold only.  There is a list of missing features in the PROJECTS file:

http://octave.svn.sf.net/viewvc/octave/trunk/octave-forge/main/control/devel/PROJECTS

Lukas



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