Re: [gpsd-dev] [PATCH] Hal Murray's explanations of how ntpd drift works

[Andy Walls]

On Thu, 2013-11-07 at 10:06 +0800, Sanjeev Gupta wrote:
> 
> On Mon, Nov 4, 2013 at 8:42 PM, Andy Walls
> <address@hidden> wrote:
>         The gnuplot commands for the loopstats file are here:
>         
>         http://lists.gnu.org/archive/html/gpsd-dev/2013-10/msg00152.html
>         
>         
>         Offset with jitter as errorbars
>            gnuplot> replot  "loopstats" using ($2):($3):($5) with
>         yerrorbars 2
>         
> 
> 
> Andy, on my gnuplot, v4.6 patchlevel 4 , the command:
> 
>     plot  "loopstats" using ($2):($3):($5) with yerrorbars 2
> 
> 
> gives an error.  Omitting the "2" at the end works.
> 
> 
> 
> Is this a gnuplot version issue, or something I am doing wrong (I have
> no experience with gnuplot, except loading files to generate graphs).

I am using an old gnuplot:

        G N U P L O T
        Version 4.2 patchlevel 6 
        last modified Sep 2009

The "2" at the end tell gnuplot to use style #2 (the color green), in my
version.

gnuplot has copious amounts of interactive help.

        gnuplot> help plot
        gnuplot> help plotting styles
        gnuplot> help using
        gnuplot> help with


Although, if you are making Python scripts to set up the plots, maybe
matplotlib ( http://matplotlib.org/ ) would be more direct and easier.

I know Fedora has matplotlib available as a distribution package.  I
will guess that very few users will have matplotlib installed by
default, compared with users with gnuplot installed.

Regards,
Andy