Re: Ignore some lines when using org-plot/gnuplot

From: Darlan Cavalcante Moreira <darcamo@gmail.com>
To: Eric Schulte <schulte.eric@gmail.com>
Cc: org-mode Mailinglist <emacs-orgmode@gnu.org>
Subject: Re: Ignore some lines when using org-plot/gnuplot
Date: Sun, 15 Nov 2009 22:54:06 -0300	[thread overview]
Message-ID: <4b00b0c3.4902be0a.4230.62af@mx.google.com> (raw)
In-Reply-To: <m2tywwa2aa.fsf@gmail.com>

Don't worry about a late reply. Sometimes I need a lot of time just to read the
E-Mails here in the list (this is one of the most active lists I have ever seen
and a really good one to follow) and I wonder how you guys not only read it but
also fix bugs and implement new features.

Thanks for this Eric. It sure opens a lot of possibilities.

- Darlan

At Sat, 14 Nov 2009 20:34:55 -0700,
Eric Schulte wrote:
> 
> Darlan Cavalcante Moreira <darcamo@gmail.com> writes:
> 
> > Hi everybody,
> >
> > Is there a way to ignore some lines when using org-plot/gnuplot to plot a table
> > in Org? I have a table with some expenses, but the last two lines are the total
> > calculated from the previous lines. I'd like to plot only the expenses and
> > ignore the last two lines.
> >
> > In the docs there is the option "deps" to specify which columns should be
> > plotted but I can't find an equivalent for lines (there is a line option but I
> > understand that it is used to send some extra command to gnuplot).
> >
> 
> Hi Darlan,
> 
> Sorry about the extremely delayed reply.  I don't believe that what
> you've described is possible in the current implementation of org-plot.
> It is possible however using org-babel which supports gnuplot.
> Org-babel now allows indexing into the values of variable assignments.
> 
> So for example a simple gnuplot example could graph the contents of a
> table by assigning that table to a variable
> 
> #+tblname: squares
> | 1 |  1 |
> | 2 |  4 |
> | 3 |  9 |
> | 4 | 16 |
> | 5 | 25 |
> | 6 | 36 |
> 
> #+begin_src gnuplot :var data=squares :results silent
>   plot data using 1:2 with lines
> #+end_src
> 
> with this new change it is possible to assign only part of the table to
> a variable as you've described above.  For example
> 
> #+tblname: squares-with-sum
> |  1 |  1 |
> |  2 |  4 |
> |  3 |  9 |
> |  4 | 16 |
> |  5 | 25 |
> |  6 | 36 |
> |----+----|
> | 21 | 91 |
> 
> #+begin_src gnuplot :var data=squares-with-sum[0:-3] :results silent
>   plot data using 1:2 with lines
> #+end_src
> 
> For more information on indexing see the documentation of the
> `org-babel-ref-index-list' function.
> 
> Thanks for motivating this new feature -- Eric
> 
> >
> >
> > - Darlan
> >
> >
> > _______________________________________________
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