Re: workflow, matlab+latex in org file

[Uwe Brauer <oub@mat.ucm.es>]

>>> "John" == John Kitchin <jkitchin@andrew.cmu.edu> writes:

   > I get the right wrapper around the results block in the org-file. I did
   > have to add :exports results
   > to the header to get it to export though.

Thanks ok the whole message you sent me I can now copy into a org file
and export it to latex, very nice.

However I just realized that I don't understand the logic of what you
sent to me. So it looks like

#+BEGIN_SRC emacs-lisp
(defun org-babel-execute:matlab (body params) 
  (interactive "P")
  (let* ((current-file (buffer-file-name)) 
	 (code (org-element-property :value (org-element-context)))
	 (result-params (cdr (assoc :result-params params)))
	 m-file
	 md5-hash)
    
    
    (with-temp-buffer 
      (insert code)
      (setq md5-hash (md5 (buffer-string))
	    mbuffer (format "*m-%s*" md5-hash)
	    m-file (format "m-%s.m" md5-hash)))
    
    ;; create the file to run
    (with-temp-file m-file 
      (insert code))

    (let ((results (shell-command-to-string
		    (concat
		     "/Applications/MATLAB_R2013a.app/bin/matlab "
		     "-nodesktop -nojvm -nosplash -nodisplay <"
		     m-file))))
      (delete-file m-file)
      (when results
	;; strip out >>
	(setq results (replace-regexp-in-string ">> " "" results))
	;; remove first 10 lines that are the header.
	(setq results (mapconcat 'identity
				 (nthcdr 10 (split-string results "\n"))
				 "\n")))
      (org-babel-result-cond result-params
	results))))
#+END_SRC

That lisp function uses a m-file, but which one?

When I run the lisp code in my org file (changing the path to my matlab
installations path) I obtain

#+RESULTS:
: org-babel-execute:matlab

But not what you have sent to me and I copied below namely

#+begin_src matlab :results output latex
clear all;
syms e p R g w K K2;
phi=[(e + (e+p)*R^2)^((g-1)/2);((e+p)*R*sqrt(1+R^2))/(e+(e+p)*R^2)];

jac=jacobian(phi,[e,p]);
ltxjac=latex(jac);
disp(ltxjac)
#+end_src

which I presume is your 
output of the lisp function?

I am sorry but I am more confused than ever.

I even see that I cannot (after I have executed your lisp function)
execute anymore the following

#+begin_src matlab :results output

t=[-3 -2 1 4 6]
y=[2 0 3 1 4]
cs = spline(t,[0 y 0 ])
[b,c,l,k,d]= unmkpp(cs)
#+end_src

I tested it several times. I restart emacs open an org mode with the
above matlab instructions and I can execute matlab. Then I execute your
lisp code and I cannot run matlab anymore in an org buffer. 
What is wrong here?


Uwe