[GH-ISSUE #375] Swap the last two expressions in RPN mode with the right arrow key #172

New issue

Open

opened 2026-05-06 13:15:59 +02:00 by BreizhHardware · 1 comment

BreizhHardware commented

2026-05-06 13:15:59 +02:00

Owner

Originally created by @ebourg on GitHub (Sep 18, 2024).
Original GitHub issue: https://github.com/UpsilonNumworks/Upsilon/issues/375

Hi, as an old HP 48GX user I really enjoy the Upsilon RPN mode, however I miss a minor feature that I used a lot : on the HP 48 the right arrow key swaps the last two values of the stack:

Would it be possible to implement this feature in Upsilon too?

Originally created by @ebourg on GitHub (Sep 18, 2024). Original GitHub issue: https://github.com/UpsilonNumworks/Upsilon/issues/375 Hi, as an old HP 48GX user I really enjoy the Upsilon RPN mode, however I miss a minor feature that I used a lot : on the HP 48 the right arrow key swaps the last two values of the stack: ![image](https://github.com/user-attachments/assets/e1c40343-5d29-4fe7-8ae1-937abab87d78) Would it be possible to implement this feature in Upsilon too?

BreizhHardware commented

2026-05-06 13:15:59 +02:00

Author

Owner

@Yaya-Cout commented on GitHub (Sep 19, 2024):

You can already swap with the parenthesis (left to swap last three values, and right to swap last two values).
Arrows are already used for navigation, but I don't know of it's really useful to navigate in the RPN input (you will probably write at most 3 characters, so you can probably erase to edit instead of using arrows) but then it won't be consistant with the rest of the interface (anyway, RPN is already a bit special for navigation).

@Yaya-Cout commented on GitHub (Sep 19, 2024): You can already swap with the parenthesis (left to swap last three values, and right to swap last two values). Arrows are already used for navigation, but I don't know of it's really useful to navigate in the RPN input (you will probably write at most 3 characters, so you can probably erase to edit instead of using arrows) but then it won't be consistant with the rest of the interface (anyway, RPN is already a bit special for navigation).