From help-octave-request at bevo dot che dot wisc dot edu Wed Dec 24 20:08:12 2003
Subject: Re: Globally global variables
From: Joe Koski <jkoski11 at comcast dot net>
To: <taltman at lbl dot gov>
CC: <help-octave at bevo dot che dot wisc dot edu>
Date: Wed, 24 Dec 2003 19:07:27 -0700

Tomer,

Thanks for the information, I'll take a look at the html pages. Apparently
the other rule is that if you declare a variable global inside a .m routine,
that variable can't also be listed on the function line of that routine.
Just found that one out by trial and error.

Joe Koski

on 12/24/03 4:36 PM, taltman at lbl dot gov at taltman@lbl.gov wrote:

> Hi Joe,
> 
> The variables to the right of the function name are the return values
> of the function. They must be assigned a value before the termination
> of the M-file, otherwise an error is signaled. You can return multiple
> values by putting more variables within brackets:
> 
> function [ month, day, year ] = date ()
> ...
> 
> Global variables can be defined within any scope (top-level, within a
> M-file, etc. ), but any called function which wishes to access that
> global variable must declare it locally. This is all described in the
> Octave manual:
> 
> http://www.octave.org/doc/octave_10.html#SEC67
> 
> So, you can do this (Octave 2.1.50)
> 
> octave> global x
> octave> x = 5
> x = 5
> octave> function new_val = increment_x ()
>> global x;
>> x = x + 1;
>> new_val = x;
>> endfunction
> octave> increment_x
> ans = 6
> octave> increment_x
> ans = 7
> octave> increment_x
> ans = 8
> octave> 
> 
> Is anything else confusing? Trust me, as a quick search of the
> help-octave archives will prove, I was very confused regarding
> this as well. :-)
> 
> ~Tomer
> 
> 
> On Dec 24, 2003 at 12:23pm, Joe Koski wrote:
> 
> jkoski >Date: Wed, 24 Dec 2003 12:23:31 -0700
> jkoski >From: Joe Koski <jkoski11 at comcast dot net>
> jkoski >To: help-octave at bevo dot che dot wisc dot edu
> jkoski >Subject: Globally global variables
> jkoski >Resent-Date: Wed, 24 Dec 2003 13:23:39 -0600
> jkoski >Resent-From: help-octave at bevo dot che dot wisc dot edu
> jkoski >
> jkoski >As a new octave user, one of the things confusing me is global
> variables. 1)
> jkoski >Functions have a return list in square brackets, that other functions
> easily
> jkoski >find. 2) The manual says that global variables must be declared in the
> jkoski >function called, not in the calling program. So be it.
> jkoski >
> jkoski >To get my variables to appear at the top octave level, it appears that
> I
> jkoski >must declare the variables as global both at the top level and in the
> octave
> jkoski >.m function. Is this true? If it is, then what is the purpose of the
> return
> jkoski >list in square brackets to the right of the function name?
> jkoski >
> jkoski >Thanks.
> jkoski >
> jkoski >Joe Koski
> jkoski >
> jkoski >
> jkoski >
> jkoski >-------------------------------------------------------------
> jkoski >Octave is freely available under the terms of the GNU GPL.
> jkoski >
> jkoski >Octave's home on the web:  http://www.octave.org
> jkoski >How to fund new projects:  http://www.octave.org/funding.html
> jkoski >Subscription information:  http://www.octave.org/archive.html
> jkoski >-------------------------------------------------------------
> jkoski >
> jkoski >
> 
> 
> 
> -------------------------------------------------------------
> Octave is freely available under the terms of the GNU GPL.
> 
> Octave's home on the web:  http://www.octave.org
> How to fund new projects:  http://www.octave.org/funding.html
> Subscription information:  http://www.octave.org/archive.html
> -------------------------------------------------------------
> 



-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
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