Re: workflow, matlab+latex in org file

[John Kitchin <jkitchin@andrew.cmu.edu>]

You might dig around in ob-octave to see how it works. It should be able
to Matlab (and on Linux/Mac I believe it might). On Windows, it has been
broken for a long time due to the lack of a proper shell (maybe that can
be adapted in win10 though).

I vaguely recall making that matlab function to try it out on Windows
some years ago.

There is a Jupyter Matlab kernel now.
https://github.com/Calysto/matlab_kernel

I was able to use this (and installing the kernel, and making sure a
matlab is on the path):

#+BEGIN_SRC emacs-lisp
(add-to-list 'org-src-lang-modes '("matlab" . matlab))

;; set default headers for convenience
(setq org-babel-default-header-args:matlab
      '((:results . "output replace")
	(:session . "matlab")
	(:kernel . "matlab")
	(:exports . "code")
	(:cache .   "no")
	(:noweb . "no")
	(:hlines . "no")
	(:tangle . "no")))

(defalias 'org-babel-execute:matlab 'org-babel-execute:ipython)
(defalias 'org-babel-prep-session:matlab 'org-babel-prep-session:ipython)
(defalias 'org-babel-matlab-initiate-session 'org-babel-ipython-initiate-session)
#+END_SRC

#+RESULTS:
: org-babel-matlab-initiate-session

To enable this:

#+BEGIN_SRC matlab :results output org drawer
x = [1, 2, 3, 4, 5];
fprintf('|%d', x)
#+END_SRC

#+RESULTS:
:RESULTS:
| 1 | 2 | 3 | 4 | 5 |
:END:

It is not much better output wise without the fprintf, but that seems to
be a feature of Matlab's output. I think Eric is probably right, you
will have use fprintf to get what you want.

I am not a big matlab user these days, so I do not have a sense for how
usable the kernel is. It does run in a session, which is a big
improvement over the other one I wrote.

Uwe Brauer writes:

>     > On Friday, 10 Mar 2017 at 16:08, Uwe Brauer wrote:
>
>     > [...]
>
>
>     > You may need to add ":exports results" to the src line.
>
>     > Also, you should also modify the code to wrap the output in an equation
>     > environment:
>
>     > disp('\begin{equation}')
>     > disp(ltxjac)
>     > disp('\end{equation}')
>
>
> I played a bit more around, and John's code is a great help but the
> matlab output for non symbolic variables is just awful
>
> As in
> #+begin_src matlab :results output
> clear all;
> x=[ 1 2 2 3 4]
> #+end_src
>
> #+RESULTS:
> :
> : x =
> :
> :      1     2     2     3     4
> :
>
> Does anybody know how to get a better formatted output, to get rid of
> the empty lines and newline? best would be a org-table?
>
> org-table-convert-region results in
>
> | :      1     2     2     3     4 |
>
> Uwe Brauer


--
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu