Re: org-babel and gnuplot

From: John Hendy <jw.hendy@gmail.com>
To: Nick Parker <nickp@developernotes.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: org-babel and gnuplot
Date: Tue, 7 Sep 2010 20:54:20 -0500	[thread overview]
Message-ID: <AANLkTi=AyuOQQPC-PuPjZiOB6GhDRYOTVz1==5kf_VoR@mail.gmail.com> (raw)
In-Reply-To: <AANLkTik81-MnBY1YXk24ZPGbQjUeK=2VvDLRh6nvWdro@mail.gmail.com>

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Hi Nick,

Maybe two things off hand (booted into OS X right now where I can't try your
code..)

1) try using straight gnuplot without going through org to verify your
commands. This helps make sure that the syntax isn't producing errors.
Another way to check this out sometimes is to C-c C-c on the code block, run
the code, and then C-x b to the *gnuplot buffer to view any error messages.
Those might prove helpful.

2) try changing your plot line to: plot data using 1:2:3 notitle

I think I ran into an issue using "$data" even though it's the gnuplot
syntax. I found org examples on the mailing list where just "data" was used
instead (no quotes) and that worked.

John

P.S. Are you trying to make a 3D graph? plot using 1:2:3 will yield a 3D
graph and you didn't mention a z-axis label so I'm wondering if that's
really what you want? You may want to split this into two graphs to have
date vs. time and date vs. distance? Or date vs. distance/time (speed)?

P.P.S Or perhaps judging by the boxwidth option you want the width of the
bars in the graph to represent the miles run? In that case you want 'plot
data using 1:2:3 with boxes notitle' I think.

On Tue, Sep 7, 2010 at 8:29 PM, Nick Parker <nickp@developernotes.com>wrote:

> Hello,
>
> I am attempting to generate a simple chart from gnuplot using the source of
> an org-table.  When I execute the gnuplot src block I get the message
> "Source block produced no output".  Does anyone have any suggestions as to
> what might be the cause?  I have included a sample of what I am trying to
> run:
>
> #+tblname: sessions
> | Date       |  Time | Distance |
> |------------+-------+----------|
> | 09/02/2010 | 15:13 |      2.5 |
> | 09/01/2010 | 14:00 |      2.4 |
>
> #+begin_src gnuplot :var data=sessions
>   :file org-running.png :exports both
>   set title "Running Stats"
>   set auto x
>   set style data histogram
>    set style fill solid border -1
>   set boxwidth .9
>   set xlabel "Date"
>   set ylabel "Time"
>   plot "$data" using 1:2:3 notitle
> #+end_src
>
> Nick Parker
> www.developernotes.com
>
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>

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