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Org-babel Matlab (session) output is malformed
From: |
Karthik Chikmagalur |
Subject: |
Org-babel Matlab (session) output is malformed |
Date: |
Thu, 09 Apr 2020 22:48:11 -0700 |
I'm trying to evaluate some Matlab code using org-babel in a session:
#+BEGIN_SRC matlab :session :results output
a = 4;
b = a + 3
c = a - 3
#+END_SRC
And following the org-babel documentation, (something like) this is the output
I expect:
#+RESULTS:
#+begin_example
b =
7
c =
1
#+end_example
But this is the output I get:
#+RESULTS:
#+begin_example
a = 4;
b = a + 3
b =
7
c = a - 3
c =
1
'org_babel_eoe'
ans =
'org_babel_eoe'
#+end_example
(Including the =#+begin_example= etc)
After going through the source of the function =org-babel= calls, here is
what's supposed to happen:
1. =org-babel-octave-evaluate-session= copies the code into the Matlab REPL
(calling =matlab-shell= if necessary) and the shell runs it.
2. It then copies the result back as a string up to the end-of-evaluation
token, and then removes the original code from the output string.
it looks like =org-babel-octave-evaluate-session= is not reading the
end-of-evaluation token (='org_babel_eoe'=) correctly, and not removing the
input code from the resulting string either. This looks like it should be an
easy fix, but I couldn't figure it out.
Any ideas how to fix this?
Notes:
1. The relevant function(s) are in
=/usr/share/emacs/27.0.90/lisp/org/ob-octave.el= or equivalent location. I am
using Emacs 27.0.90.
2. The same org-babel module pulls double duty for Octave and Matlab with a
flag to distinguish between uses, hence the name. When I run the same test as
an Octave source block it runs correctly:
#+BEGIN_SRC octave :session :results output
a = 4;
b = a + 3
c = a - 3
#+END_SRC
#+RESULTS:
:
: b = 7
: c = 1
3. This issue regards evaluation of source blocks with the =:results output=
option, where org-babel includes in the results block everything that the REPL
prints to stdout. (This is different from the default =:results value= option
where only the return value of the block is considered as a result.)
- Karthik
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