From: Eric S Fraga <e.fraga@ucl.ac.uk>
To: Derek Thomas <derekcthomas@gmail.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Maxima persistence between code blocks
Date: Thu, 28 Apr 2011 11:56:39 +0100 [thread overview]
Message-ID: <874o5ifxug.fsf@ucl.ac.uk> (raw)
In-Reply-To: <BANLkTimyoxKEY5CfFDJeW_xQ3obJLGS=pw@mail.gmail.com> (Derek Thomas's message of "Wed, 27 Apr 2011 13:08:37 -0500")
Derek Thomas <derekcthomas@gmail.com> writes:
> I'm interested in using org-mode with babel to organize my maxima
> code. Am I correct in my reading of ob-maxima.el that the babel
> module for maxima doesn't support persistent variables between code
> blocks?
Correct, basically.
> If so, this seems like a severe limitation.
There are solutions (see below), but their suitability will depend on
*your* use case. What specifically can you not do currently that you
would like to do (or do more easily)?
> I did some
> searching and found this guide
> (http://www.math.utexas.edu/pipermail/maxima/2010/021027.html) for
> setting up a local maxima "server".
>
> I'm trying to implement an org
> interface to this process, but my elisp skills are extremely
> rudimentary. If anyone has any suggestions or recommendations for
> code that does something similar, that would be great. Thanks,
For org + babel, the more appropriate solution might be to add session
support for maxima. In principle, this should be possible as one can
have a maxima inferior process; there is no need to re-invent the wheel
as described above basically. However, I am not sure how to go about
doing this. I'll investigate when I have some time (but am not
promising anything soon unfortunately) but maybe you could have a look.
Check out other babel languages that provide session support (R?).
In the meantime, there are two alternatives, which I use all the time,
which may help: code tangling =(info "(org) Extracting source code")=
and noweb =(info "(org) Noweb reference syntax")=. I use the latter
frequently:
--8<---------------cut here---------------start------------->8---
#+srcname: units
#+begin_src maxima
h: 3600*s$
day: 24*h$
#+end_src
#+srcname: unitstest
#+begin_src maxima :results output :exports results :noweb yes
<<units>>
solution: solve([m = 2*day], [m]),numer$
print(solution);
#+end_src
#+results: unitstest
: [m = 172800 s]
--8<---------------cut here---------------end--------------->8---
Note the =<<units>>= reference in the latter code block.
HTH,
eric
--
: Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 24.0.50.1
: using Org-mode version 7.5 (release_7.5.209.g1a687)
prev parent reply other threads:[~2011-04-28 10:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-27 18:08 Maxima persistence between code blocks Derek Thomas
2011-04-28 10:56 ` Eric S Fraga [this message]
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