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 https://github.com/JuliaSymbolics/Symbolics.jl/pull/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.

[sebeaumont]

What's the correct solution here? It's really annoying that this used to work fine. @akirakyle I notice no one cared to respond to your comment on the Symbolics.jl PR I doubt that will get reversed now.

After further investigation both Jupyter lab/notebook and Pluto render this ok. IIRC they are MathJax based.

The workaround from @dalanicolai works fine in org-mode src-blocks (👍) but multiline $$ stuff is not rendered properly in jupyter-repl which is a pain.

I added this using @dalanicolai filter

(advice-add 'jupyter-insert-latex :around #'jupyter-julia-trim-latex) I wonder where it will crop up again AFAICT $$ is not the right way to do this but I'm no LaTeX guru.

[sebeaumont]

I tracked it to down to a bug in org-format-latex -- which has a hardcoded regex to find latex fragments and ignores any :matchers in org-format-latex-options which normally includes $$. See here also: https://emacs.stackexchange.com/questions/78093/removing-certain-latex-preview-matchers-from-org-mode - so this should go away sometime soon.