[Matlab-emacs-discuss] Matlab+python+org mode a problem with the plot command

[Uwe B. <ou...@ma...>]

* Matlab+python+org mode a problem with the plot command

Hi

The following is a bit off topic, my apologies, but it concerns matlab
and emacs and I hope that maybe someone on a list could give me a
hint.

While matlab-mode is very useful for writing code and debug it, I also
need the feature of executing code and insert its result nicely
formatted in the buffer.

This can be achieved by 

  - first installing the python matlab kernel https://de.mathworks.com/help/matlab/matlab_external/install-the-matlab-engine-for-python.html
  - install the jupyter matlab kernel
    sudo dpkg --purge python3-ptyprocess
    sudo -H pip3 install --upgrade --force-reinstall --no-cache-dir jupyter
    sudo -H pip3 install --upgrade --force-reinstall --no-cache-dir numpy
    sudo -H pip3 install --upgrade --force-reinstall --no-cache-dir pymatbridge
    sudo -H pip3 install --upgrade --force-reinstall --no-cache-dir matlab_kernel
  - start the engine https://de.mathworks.com/help/matlab/matlab_external/start-the-matlab-engine-for-python.html
  - use org mode
  - install ob-ipython.
  - execute 
#+BEGIN_SRC emacs-lisp
(setq org-confirm-babel-evaluate nil)   ;don't prompt me to confirm everytime I want to evaluate a block
;;; display/update images in the buffer after I evaluate
(add-hook 'org-babel-after-execute-hook 'org-display-inline-images 'append)
    
(add-to-list 'org-src-lang-modes '("matlab" . matlab))
(setq python-shell-interpreter "python3")
;(setq python-shell-interpreter "/usr/bin/python3.6")
;(setq python-shell-interpreter "/usr/bin/python2.7")
;; 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

Then use the following example


#+begin_src matlab :results output latex :exports results  :eval never-export :wrap latex
x = [1, 2, 3, 4, 5];
fprintf('|%d', x)
#+end_src

And it works like charm.

However and now comes the question:

#+begin_src matlab :results output latex :exports code  :eval never-export :wrap latex
clear all
close all
t=[0:0.1:1];
y=sin(t);
figure(1)
plot(t,y)
#+end_src

The plot figure *does not* pop, while if I use the emacs matlab-shell it does.

If somebody has a clue or hint I would be extremely grateful

regards

Uwe Brauer