Hi, I am using ob-ipython (which is a bit outdated) and I already opened an issue at https://github.com/gregsexton/ob-ipython/issues/226
However if someone knows how to deal with the (json-readtable-error 47)
error type, I would appreciate it.
Uwe Brauer
Here is the explanation.
I successfully used ob-ipython with org mode and matlab, with Ubuntu 16.04,
python 3.5 and matlab 2019a, its python engine (and emacs 29.0.5
compiled from a commit which was a pre 29 release)
Now I had to upgrade to Ubuntu 24.04 with python 3.12 (and emacs 29.4,
I also tried out the same 29.0.50 version I used in Ubuntu 16.04)
When I repeated the steps I list below and run
#+begin_src matlab
x = [1, 2, 3, 4, 5];
fprintf('|%d', x)
#+end_src
I obtain
#+begin_src
Debugger entered--Lisp error: (json-readtable-error 47)
signal(json-readtable-error (47))
json-read()
ob-ipython--collect-json()
ob-ipython--execute-request("x = [1, 2, 3, 4, 5];\nfprintf('|%d', x)"
"matlab")
ob-ipython--execute-sync("x = [1, 2, 3, 4, 5];\nfprintf('|%d', x)"
((:colname-names) (:rowname-names) (:result-params "output" "replace")
(:result-type . output) (:results . "output replace") (:exports . "code")
(:session . "matlab") (:kernel . "matlab") (:cache . "no") (:noweb . "no")
(:hlines . "no") (:tangle . "no")))
org-babel-execute:matlab("x = [1, 2, 3, 4, 5];\nfprintf('|%d', x)"
((:colname-names) (:rowname-names) (:result-params "output" "replace")
(:result-type . output) (:results . "output replace") (:exports . "code")
(:session . "matlab") (:kernel . "matlab") (:cache . "no") (:noweb . "no")
(:hlines . "no") (:tangle . "no")))
org-babel-execute-src-block(nil ("matlab" "x = [1, 2, 3, 4,
5];\nfprintf('|%d', x)" ((:colname-names) (:rowname-names) (:result-params
"replace" "output") (:result-type . output) (:results . "replace output")
(:exports . "code") (:tangle . "no") (:hlines . "no") (:noweb . "no") (:cache .
"no") (:kernel . "matlab") (:session . "matlab")) "" nil 1371 "(ref:%s)"))
org-ctrl-c-ctrl-c(nil)
funcall-interactively(org-ctrl-c-ctrl-c nil)
call-interactively(org-ctrl-c-ctrl-c nil nil)
command-execute(org-ctrl-c-ctrl-c)
#+end_src
any idea how to fix this?
Below the steps.
Steps
#+begin_src
sudo dpkg --purge python3-ptyprocess
pip3 install --user --upgrade --force-reinstall --no-cache-dir jupyter
pip3 install --user --upgrade --force-reinstall --no-cache-dir pymatbridge
pip3 install --user --upgrade --force-reinstall --no-cache-dir matlab_kernel
python3 -m matlab_kernel.check
#+end_src
#+begin_src
cd *usr/local/MATLAB/R2024b/extern/engines/python*
sudo /usr/bin/python3 setup.py install
#+end_src
Then
#+begin_src
/usr/bin/python3
in the python prompt:
import matlab.engine
eng = matlab.engine.start_matlab()
#+end_src
#+BEGIN_SRC emacs-lisp
(setq org-confirm-babel-evaluate nil) ;don't prompt me to confirm everytime I
want to evaluate a block
(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 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
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