Re: Plotting date on xaxis

From: "Eric Schulte" <schulte.eric@gmail.com>
To: Johan Ekh <ekh.johan@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Plotting date on xaxis
Date: Tue, 23 Feb 2010 07:47:25 -0700	[thread overview]
Message-ID: <87zl30c6zn.fsf@gmail.com> (raw)
In-Reply-To: 417457b51002221031k48e2470aof86f6b6e71ea454b@mail.gmail.com

Hi Johan,

You could try plotting your table using standard org-mode date formats
which org-plot will understand without any need to specify a timefmt
string.

#+PLOT: title:"Weight" ind:1 deps:(2) type:2d with:linespo set:"xdata time" set:"yrange [90:]"
| Date             |   Kg |
|------------------+------|
| <2010-02-21 Sun> | 95.0 |
| <2010-02-22 Mon> | 93.0 |
| <2010-02-23 Tue> | 92.0 |
| <2010-02-24 Wed> | 91.5 |
| <2010-02-25 Thu> | 91.0 |
| <2010-02-26 Fri> | 92.0 |

Alternatively if you want more control over your plots and more direct
access to gnuplot you can use org-babel to pass your table directly to
gnuplot as follows.

#+results: my-table
|       Date |   Kg |
|------------+------|
| 2010-02-21 | 95.0 |
| 2010-02-22 | 93.0 |
| 2010-02-23 | 92.0 |
| 2010-02-24 | 91.5 |
| 2010-02-25 | 91.0 |
| 2010-02-26 | 92.0 |

#+begin_src gnuplot :var data=my-table
  set xdata time
  set timefmt '%Y-%m-%d'
  set yrange [90:]
  plot data using 1:2 with linespoints title 'Kg'
#+end_src

Best -- Eric

Johan Ekh <ekh.johan@gmail.com> writes:

> Hi all,
> I try to plot a table looking like this
>
>      |       Date    |   Kg |
>      |-----------------+--------|
>      | 2010-02-21 | 95.0 |
>      | 2010-02-22 | 93.0 |
>      | 2010-02-23 | 92.0 |
>      | 2010-02-24 | 91.5 |
>      | 2010-02-25 | 91.0 |
>      | 2010-02-29 | 92.0 |
>      |                  |        |
>
> with the dates on the xaxis using
>
> #+PLOT: title:"Weight" ind:1 deps:(2) type:2d with:linespo set:"xdata time" timefmt:%Y-%m-%d
> set:"yrange [90:]"
>
> but no plot is generated. If I remove <set:"xdata time">, the plot is generated but without
> interpreting the dates as dates.
>
> Can anyone see what I do wrong?
>
> Thanks in advance,
>
> Johan
>
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