Re: Different plot behavior in octave and gnuplot

[Laurent Hoeltgen]

On 12/09/12 18:49, emooshag wrote:
> Hello All,
> I just installed octave on my Mac (OS 10.6.8) using Homebrew. I'm trying to
> use the gnuplot from octave but getting different behavior than from gnuplot
> itself.
>
>  From gnuplot, plot sin(x) gives a red sine wave, as expected, but from
> octave, the same command gives an empty figure.  Likewise, in gnuplot, "plot
> (5)", for example, gives a red horizontal line at y = 5, as expected, but
> from octave it gives an empty figure.  However, if I do something like:
>
> octave> x = 1:100;
> octave> plot (x)
>
> The I get a visible blue diagonal line.
>
> Possibly useful info:
> gnuplot is set to x11 term type.
>
> octave: system ("which gnuplot")
> /usr/local/bin/gnuplot
> ans = 0
>
> terminal:~$ which gnuplot
> /usr/local/bin/gnuplot
>
> gnuplot> show loadpath
> loadpath is empty
>         gnuplotrc is read from /usr/local/Cellar/gnuplot/4.6.0/share/gnuplot/4.6
>         no XAPPLRESDIR found in the environment,
>             falling back to "/etc/X11/app-defaults/"
>
>
> I assume that octave is not getting the some default parameters (line
> colors, weights, etc.) that are being used when i'm in gnuplot but cannot
> figure out how to get octave to use them too. I realize I can probably
> change the octave behavior setting parameters .octaverc, but it seems like
> that shouldn't be necessary. How do I point to the gnuplot settings?
>
> Any help is appreciated.
>
> Thanks,
> Eric
>
>
>
>
>
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Hi,

octave and gnuplot are two different programs that use different 
syntaxes. The equivalent for gnuplot's sin(x) in octave would for 
example be something like:

plot(linspace(0,2*pi,100),sin(linspace(0,2*pi,100));

I suggest you read the octave manual about plotting. It contains a lot 
of explanations on how to achieve various formattings of the plots in 
octave.

Regards,
Laurent