(-) precedence

[mfleming]

(12-10-2022 04:18 PM)Maximilian Hohmann Wrote:  Hello!


If you have a device that runs Android you can compile an APL calculator app from here: https://github.com/dzaima/APL/tree/master/AndroidIDE
There are some pictures of the keyboard furher down the page. To be honest, for me a keyboard like that looks rather scary ;-) But at least one never needs to think about operator precence ever again.

Regards
Max

I tried that a few years ago but found it was difficult to view on the small screen of a phone. Looks like they've added connectivity to a Dyalog server via Ride, so I'll have to try this again on a tablet. Thanks Max.

(12-10-2022 06:56 PM)rprosperi Wrote:  Thanks Max. Those keyboard images confirm my very worst fears of how truly hostile such an APL keyboard would appear. Note I said "...would really like to see...". I certainly would never want to use such a beast, I fear it may cause permanent loss of brain function as regards using RPN. Waaaay too risky...

Actually, an APL calculator would look an awful lot like a DM42 with a slightly different faceplate. If you're doing some quick calculations you wouldn't want to type 1○○0.25 to get the sine of pi/4 or ⍟27 for natural log of 27. Just leave the main keys as they are. All those chicken-scratch symbols would be available from a few soft menus above the unlabeled top keys, much like the DM42 or WP43. Have an option to show your equation as-is or display the APL equivalent to what you typed in. Learn APL as you go along.

The display would look like a series of expressions and results displayed like the Prime or HP48/50. Now how might one combine APL with an RPN stack