Re: [org-plot] multiple graphs on a plot

["Eric Schulte" <schulte.eric@gmail.com>]

Hi Eric,

I don't believe anyone has yet extended org-plot to support multiple
independent variable columns.  Since stating work on Org-babel [1], I
know use gnuplot source-code blocks for all of my plotting needs, as
they provide a more direct interface into gnuplot.  For example the
following should provide the functionality your are looking for...

#+tblname: my-table
|   1 | 2 | 1.5 | 3 |
|   2 | 4 |   3 | 9 |
| ... |   |     |   |

#+begin_src gnuplot :var data=my-table
  plot data using 1:2, data using 3:4
#+end_src

Cheers -- Eric

Eric S Fraga <ucecesf@ucl.ac.uk> writes:

> Back in September, zwz asked about getting multiple graphs on a plot
> from a table:
>
> http://lists.gnu.org/archive/html/emacs-orgmode/2009-09/msg00354.html
>
> There appears to be no answer to that question.  I have the same need
> and I was wondering if anybody has an answer to this.  
>
> Basically, given a table that looks like this:
>
> | x   | y1 |   x | y2 |
> | 1   |  2 | 1.5 |  3 |
> | ... |    |     |    |
>
> I want to plot y1 versus x as one line on a plot and y2 versus x as
> another line on the same plot.  In gnuplot, this is straightforward:
>
>   plot ... using 1:2, '' using 3:4
>
> but org-plot currently assumes :ind to have just one entry.  I have
> started to look at the code in org-plot to see how to generalise ind
> to be a vector of columns but would rather avoid the work if somebody
> else has already done this (and because although my elisp skills are
> improving daily due to org-mode, they are still rather rudimentary
> ;-).
>
> Thanks,
> eric
>
>
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Footnotes: 
[1]  http://orgmode.org/worg/org-contrib/babel/