Julia source blocks produce no output

[aceross]

Every time I execute a source block with Julia (e.g. C-c C-c), I get the message Code block produced no output The source blocks start a Julia REPL but do not send any lines to it. The error provided is:
Error running timer ‘jupyter-event-handler’: (wrong-type-argument number-or-marker-p t)

I have tried this in both Ubuntu 20.04 and MacOS 10.15 "Catalina".

Given that others seem to use the package without this issue, I am a bit baffled as to what is going on.

Thanks in advance for any advice that can be offered.

[fleimgruber]

How did you set up emacs-jupyter with respect to Julia?

[jave]

This works for me at least.

like this:

#+begin_src jupyter-julia :session julia :results value :exports both
@variables A B a b c d e f g h i j k l m n o p q r
A=[a b c;
d e f;]

transpose(A)

#+end_src

#+RESULTS:
#+begin_export latex
\begin{equation}
\left[
\begin{array}{cc}
a & d \
b & e \
c & f \
\end{array}
\right]
\end{equation}
#+end_export

and installation:
(use-package jupyter
:ensure t)

(org-babel-do-load-languages
'org-babel-load-languages
'(
;;old
(dot . t)
(plantuml . t)
(gnuplot . t)
(ess-julia . t)
;;new
(emacs-lisp . t)
(julia . t)
(python . t)
(jupyter . t)))

sudo dnf install python3-jupyter-console

[dalanicolai]

FYI

I am trying out the Julia Symbolics package, but I prefer to see the latex-preview. However, we can make things work with org-latex-preview as follows:

As for latex equations, the export block is not required, I am using the header argument :results raw.
However, different from @jave his results, the output here gets wrapped between $$. Also, for the equation environment, the $$ is not required so I have added the following advice to remove them:

(defun jupyter-julia-trim-latex (orig-fun data)
  (apply orig-fun (list (string-trim data "[ $]+" "[ $]+"))))

(advice-add 'jupyter-org--parse-latex-element :around #'jupyter-julia-trim-latex)

Only problem is that the :RESULTS do not automatically get replaced. But we can use org-babel-remove-result(-one-or-many).

Hope this might be useful to anybody (and that users will find it here :)

[akirakyle]

@dalanicolai Latexify with symbolics was working fine before JuliaSymbolics/Symbolics.jl#763

I made a comment on that PR to try to understand why that change was made so hopefully we can know what the right fix here might be.