[Octave] Re: DEMOcontrol and bodeplots

[Hugo Coolens]

On Thu, 26 Feb 2004, Hugo Coolens wrote:

> 
> 
> 
> On Mon, 23 Feb 2004, John W. Eaton wrote:
> 
> > On 23-Feb-2004, Hugo Coolens <address@hidden> wrote:
> > 
> > | I'm trying out Octave 2.1.53 on a Quantian Live Linux CD.
> > | 
> > | Things are going quite wrong when I do the following:
> > | DEMOcontrol
> > | [1] System Representation
> > | [2] Initialize a system
> > | save to `octave-core' complete
> > | Segmentation fault
> > | 
> > | I also have a version 2.1.35 installed on Debian Woody, this works a
> > | little better but doing the following also goes completely wrong:
> > | octave:2> sys=tf2sys([3 1],[1 3 1]);
> > | octave:3> bode(sys)
> > | error: logspace: arguments must be scalars
> > | error: evaluating if command near line 71, column 5
> > | `/usr/share/octave/2.1.35/m/control/base/bode.m'
> > | 
> > | Does anybody here on the list how to solve these problems?
> > 
> > Upgrade to 2.1.55.  The demo appears to work properly with that
> > version.
> I did an upgrade to 2.1.55 (using the latest Quantian: 4.9.4 and also
> building one on a debian woody system),
> DEMOcontrol seems indeed to work now.
> However I have a small new problem:
> the stem function doesn't work anymore?
> I try to do something like this:
> y=filter(b,a,x)
> plot(time,stem(y))
> is there a reason why stem no longer is available?
> is there an alternative to perform this function?
apologies for posting this too soon, I'm just starting with Octave and
realised too late that stem is in fact part of octave-forge. Strange
enough, it worked by default on the previous version of Quantian (4.9.3)
but not on the current version.

hugo



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