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Re: control pkg


From: Lukas Reichlin
Subject: Re: control pkg
Date: Mon, 13 Feb 2012 15:22:12 +0100

On 13.02.2012, at 15:07, Doug Stewart wrote:

> I have
> 
> octave:1> ver
> ----------------------------------------------------------------------
> GNU Octave Version 3.6.1-rc0
> GNU Octave License: GNU General Public License
> Operating System: Linux 2.6.32-38-generic #83-Ubuntu SMP Wed Jan 4 11:13:04 
> UTC 2012 i686
> ----------------------------------------------------------------------
> Package Name   | Version | Installation directory
> ---------------+---------+-----------------------
>       control *|   2.2.4 | /home/doug/octave/control-2.2.4
> miscellaneous *|  1.0.11 | /home/doug/octave/miscellaneous-1.0.11
>         optim *|  1.0.17 | /home/doug/octave/optim-1.0.17
>        signal *|   1.1.2 | /home/doug/octave/signal-1.1.2
>       specfun *|   1.1.0 | /home/doug/octave/specfun-1.1.0
>        struct *|   1.0.9 | /home/doug/octave/struct-1.0.9
> 
> 
> i do:
> 
> octave:2> help c2d
> error: help: `c2d' not found
> 
> but   
> octave:2> help tf
> `tf' is a function from the file /home/doug/octave/control-2.2.4/@tf/tf.m
> 
>  -- Function File: S = tf ("S")
>  -- Function File: Z = tf ("Z", TSAM)
>  -- Function File: SYS = tf (SYS)
>  -- Function File: SYS = tf (N
> 
> 
> Why are some of the things in control pkg available and others are not?????
> 
> Doug
> 
> 
> 
> -- 
> DAS

I can't help it. You have to type "help @lti/c2d". It is explained in the 
control.pdf, located in /home/doug/octave/control-2.2.4/doc:

> Using the help function
> Some functions of the control package are listed with a leading @lti/. This 
> is only needed to view the help text of the function, e.g. help norm shows 
> the built-in function while help @lti/norm shows the overloaded function for 
> LTI systems. Note that there are LTI functions like pole that have no 
> built-in equivalent.
> When just using the function, the leading @lti/ must not be typed. Octave 
> selects the right function automatically. So one can type norm (sys, inf) and 
> norm (matrix, inf) regardless of the class of the argument.

Lukas



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