[org-plot] multiple graphs on a plot

[org-plot] multiple graphs on a plot

[Eric S Fraga]

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

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

[Eric Schulte]

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
>
>
> _______________________________________________
> Emacs-orgmode mailing list
> Please use `Reply All' to send replies to the list.
> Emacs-orgmode@gnu.org
> http://lists.gnu.org/mailman/listinfo/emacs-orgmode

Footnotes: 
[1]  http://orgmode.org/worg/org-contrib/babel/

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

[Eric S Fraga]

At Wed, 03 Feb 2010 10:34:24 -0700,
Eric Schulte wrote:
> 
> 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

Eric (& Tom as well),

This works like a charm!  I should have guessed that org-babel would
be able to come to the rescue :-) Many thanks.

Being able to embed such arbitrary programming languages etc is
changing my whole workflow even more than org-mode itself did.  A
typical org file of mine these days seems always to include latex,
shell commands and maxima code, and I can now add gnuplot to this set.
Interestingly, 15 years on, org-mode &co. are accomplishing what the
CMU folk wanted to do with their Andrew project, specifically their
=ez= editor.

It used to be that I hated leaving emacs to do anything; now it's
getting to the point that I hate even leaving org-mode!  I wonder if I
can embed wanderlust within org-mode... ;-)

Thanks again,
eric