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

[Eric Schulte]

Darlan Cavalcante Moreira <address@hidden> 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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