Notebook cell only prints last output

[avishai987]

System details:

Positron and OS details:

Positron Version: 2025.12.2 (system setup) build 5
Code - OSS Version: 1.106.0
Commit: f5a10d0
Date: 2025-12-11T21:42:54.225Z
Electron: 37.7.0
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Windows_NT x64 10.0.26200

Session details:

R 4.3.3, ark 0.1.203

Describe the issue:

When running chunk in jupyter notebook, only the last value is printed.

Steps to reproduce the issue:

Create jupyter notebook, create chunk, e.g:

a=1
b=2
a
b

run it, output :

2

Screenshot:

It is even more annoying if you forgot an empty line, you would see nothing:

Expected or desired behavior:

Print all values, like in vs-code/ Rstudio

1
2

Were there any error messages in the UI, Output panel, or Developer Tools console?

No.

I searched for issue for this but haven't found any.

Thanks!

[rodrigosf672]

Thank you for raising this issue, @avishai987. If I understood correctly, this is standard Jupyter/IPython behavior: only the last expression in a cell is automatically displayed. Earlier expressions are evaluated but not shown unless you use print() or display() statements. Example below:

This differs from RStudio, which auto-prints each expression. For that reason, I'll definitely move this to Triage so that we can discuss whether better documentation would be helpful here, or if another approach would be more intuitive. Thanks for bringing this up.

[avishai987]

Thank you for raising this issue, @avishai987. If I understood correctly, this is standard Jupyter/IPython behavior: only the last expression in a cell is automatically displayed. Earlier expressions are evaluated but not shown unless you use print() or display() statements. Example below:

This differs from RStudio, which auto-prints each expression. For that reason, I'll definitely move this to Triage so that we can discuss whether better documentation would be helpful here, or if another approach would be more intuitive. Thanks for bringing this up.

Thanks! I don't know if this is more related to ARK, but when I run IRkernel with vscode it does displays all values. Anyway, if it possible it would be nice to have the option to change it, similar to IPython:

from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"

So moving from IRkernel/vscode/Rstudio would be smoother, without needing to change the code.

Thanks,
Avishai

[cindyytong]

@juliasilge Will remove the notebook flag for the Ark team to determine best next steps