Re: [Orgmode] Re: org-babel-gnuplot broken today?

[Eric Schulte]

Ah,

My apologies, thank you both for persisting in raising this issue.

It seems there are *two* ways to pass variables into gnuplot.  One uses
user variables [1], and the other directly replaces variables in the
code block [2].  You've been using the former, and I've been using the
latter.  The bug only existed in the former, but I believe I've now
fixed that issue, and in fact I think I'll start using user variables as
in your example below.

Please let me know if the problem persists after a fresh pull of the
repository.

Best -- Eric

Nick Dokos <address@hidden> writes:

> Eric Schulte <address@hidden> wrote:
>
>> Hi Nigel,
>> 
>> Org-mode gnuplot code blocks do make use of user variables [1] for
>> passing arguments into gnuplot.  I believe that this feature may only be
>> available in later versions of gnuplot.  I'm using gnuplot 4.4 locally
>> and I've had no problems using gnuplot from Org-mode code blocks which I
>> do most every day.
>> 
>
> Did you try the example that Nigel posted? I think babel *is* broken.
> I tried a bisect and can verify that
>
> commit f16c46c856afbd41b115a6a50306c0c002cdb333 is good 
> (release_7.01h-750-gf16c46c)
> commit b664510ec4811491e4611791c24591153abdf5f3 is bad  
> (release_7.01h-800-gb664510)
>
> but the sequence is not bisectable: when it tries the middle commit
> 2699f4e9bc7695432cf6aaf1dd48e182b10c2847 (release_7.01h-775-g2699f4e)
> it gets "Symbol's value as variable is void: result-type" and it's
> not clear to me how to proceed with the bisection at that point. I tried
> skipping a bit, but the results were mixed at best.
>
> So it looks to me as if something in those 50 commits broke it.
>
> HTH,
> Nick
>
>
>> the syntax for defining variables is fairly simple, try the following
>> directly in the gnuplot terminal, if your gnuplot does have variable
>> support it should graph a straight line of y=3D10
>> #+begin_src gnuplot
>>   a=3D10
>>   plot a
>> #+end_src
>> 
>> Best -- Eric
>> 
>> Nigel Beck <address@hidden> writes:
>> 
>> > John - thanks for the quick reply (and, btw, the very useful tutorial).
>> >
>> > I ought to have noted that the example works fine when invoked directly
>> > from the command line, with the only change being that I move the data
>> > into a file (mainly because I don't know the correct gnuplot syntax for
>> > putting table data into a variable!).
>> >
>> > I haven't updated gnuplot since installing it, so I believe the org-mode
>> > <-> gnuplot unfriendliness lies in some effect that a recent pull of
>> > 7.01trans has had. (I did updated emacs-w3m from cvs the other day, so I
>> > suppose thats another possible source of error, but it seems unlikely).
>> >
>> > I agree that it appears that the table data being handed to gnuplot
>> > from org-mode is somehow being formatted in a way that gnuplot does not u=
>> nderstand.
>> >
>> > John Hendy <address@hidden> writes:
>> >
>> >> On Tue, Oct 26, 2010 at 3:10 PM, Nigel Beck <address@hidden> wrote:
>> >>
>> >>     I refreshed today 7.01trans and noticed I couldn't get my gnuplots to
>> >>     plot anymore: data from a table within the org file is no longer
>> >>     digested nicely by gnuplot.
>> >>
>> >> That's odd. I wrote the tutorial and thus my heart skipped a beat for a =
>> moment!
>> >> =C2=A0
>> >>
>> >>     To test, I used the snippet below from the worg
>> >>     http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-gnuplot.p=
>> hp:
>> >>
>> >>     ** Data Table Plot
>> >>=20=20=20=20
>> >>     Plotting data points from a table could look like this:
>> >>     #+tblname: basic-plot
>> >>
>> >> ---- 8< ----
>> >> =C2=A0
>> >>
>> >>     Exporting or executing the gnuplot piece, Gnuplot (Gnuplot 4.4 patch
>> >>     =C2=A0level 1) complains:
>> >>=20=20=20=20
>> >>     gnuplot> plot data u 1:2 w p lw 2 title 'x vs. y1', \
>> >>
>> >> ---- 8< ----
>> >> =C2=A0
>> >>
>> >>     =C2=A0 =C2=A0 =C2=A0 =C2=A0 No data in plot
>> >>
>> >>     So of course no basic-plot.png is created....
>> >>=20=20=20=20
>> >>     As far as I know, my gnuplots were happy sometime within the past we=
>> ek
>> >>     refreshing org-mode from git basically daily...
>> >>
>> >> That's odd indeed. I copied and pasted your exact table and code from th=
>> e email and was able to generate the plot. The error is
>> >> quite odd. It almost makes me wonder if something is different about how=
>>  gnuplot is receiving the data. Like a syntax error or
>> >> something. I would say that at this point it's not the table or code, pe=
>> r se, since I can generate the plot. Hopefully someone will
>> >> chime in with more experience who may have seen this error?
>> >>
>> >> One thing to try in the meantime... Gather up some gnuplot test data fil=
>> e and try to run it from the command line perhaps? It would
>> >> at least be one way to see if it's working outside of org-mode?
>> >>
>> >> Best regards,
>> >> John
>> >> =C2=A0
>> >>
>> >>     _______________________________________________
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>> >>     http://lists.gnu.org/mailman/listinfo/emacs-orgmode
>> >>
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>> 
>> Footnotes:=20
>> [1]  http://www.gnuplot.info/docs/gnuplot.html#x1-3100013.4
>> 
>> 
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>> 

Footnotes: 
[1]  using user variables
#+results: some-more-gnuplot
| 1 |  1 |
| 2 |  4 |
| 3 |  9 |
| 4 | 16 |
| 5 | 25 |
| 6 | 36 |
| 7 | 49 |
| 8 | 64 |
   #+TBLFM: $2=$1*$1

#+begin_src gnuplot :var data=some-more-gnuplot
  plot data
#+end_src

[2]  direct replacement
#+results: some-more-gnuplot
| 1 |  1 |
| 2 |  4 |
| 3 |  9 |
| 4 | 16 |
| 5 | 25 |
| 6 | 36 |
| 7 | 49 |
| 8 | 64 |
   #+TBLFM: $2=$1*$1

#+begin_src gnuplot :var data=some-more-gnuplot
  plot "$data"
#+end_src