From help-octave-request at bevo dot che dot wisc dot edu Thu Jan 22 16:33:58 2004
Subject: Re: Setting plot ranges
From: geordie dot mcbain at aeromech dot usyd dot edu dot au
To: Joe Koski <jkoski11 at comcast dot net>,    Octave_post <help-octave@bevo.che.wisc.edu>
Date: Fri, 23 Jan 2004 09:25:43 +1100

It's not pretty, but compare:

-*-
y = x = (0:100)';
y(end) *= 100; 
plot (x,y); 
-*-

and

-*-
x = (0:100)';
y(end) *= 100;
Ymax = 2*mean (y);
graw (sprintf ("set yrange [0:%g]\n", Ymax));
plot (x, y);
-*-


On Fri, 23 Jan 2004 08:35 am, Joe Koski wrote:
> In a recent exercise, because of some extreme "outliers," I needed to
> override the vertical axis of a plot with gset yrange. I had been entering
> this range "manually" e. g., gset yrange [0:10], but the scale varied from
> plot to plot, so I decided to automate the process by calculating a maximum
> that filtered out the extreme values.
>
> It appears that you can't enter a real (or string) variable such as
>
> Ymax = 2.0*mean(y);
> S_Ymax = num2str(Ymax);
>
> into the gset yrange [0:Ymax] or gset yrange [0:S_Ymax] command. Octave
> just tells me that Ymax or S_Ymax are undefined.
>
> Is there trick to doing this, or must plot ranges be entered only
> numerically, without the use of variable names?
>
> Thanks for the advice.
>
> Joe Koski
>
>
>
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