free42 Custom Unit Conversion Factors
| Author: | Mitch Richling |
| Updated: | 2024-02-12 12:55:56 |
Copyright 2024 Mitch Richling. All rights reserved.
Table of Contents
1. Metadata
The home for this HTML file is: https://richmit.github.io/hp42/unit.html
A PDF version of this file may be found here: https://richmit.github.io/hp42/unit.pdf
Files related to this document may be found on github: https://github.com/richmit/hp42
Directory contents:
src |
- | The org-mode file that generated this HTML document |
src_42s |
- | Ready to convert source listings for 42s code in this document |
docs |
- | This html document and associated PDF |
bin |
- | Importable RAW program files |
2. Introduction
This application has a few unit conversions for temperatures; however, the focus is on a nice way to organize and recall various conversion factors I frequently use. That is to say, I don't really want to convert "in" to "cm", instead I want to push the conversion factor to the stack.
Aside from the TEMP menu, all of the menus have the same structure. The first menu key is the "base" unit for that page. Pressing any menu key will push
a conversion factor for the given unit to the "base" unit to the stack. For example, if the left most menu is "mm" then pressing the "in" button will push
25.4 to the stack – the value you would multiply by to convert from inches to millimeters or divide by to convert from millimeters to inches.
Some constants are little programs. In some cases these are derived conversion factors, and the programs make that explicit. More importantly in cases when the base conversion factors are exact quantities, the programs insure we obtain machine accuracy – i.e. 1/2.54 is better than 0.3937.
3. Units
3.1. Conversion Factors
| Type | Conversion | Description ………. |
|---|---|---|
| Leng:mm | 1.0 | |
| Leng:Ang | 1e-7 | Angstrom |
| Leng:μm | 0.001 | Micron |
| Leng:mil | FUNC 01; 25.4; 1000; ÷ | mil (1/1000 in) |
| Leng:cm | 10 | |
| Leng:in | 25.4 | Inch |
| Leng:in | 1 | |
| Leng:hand | 4 | |
| Leng:ft | 12 | |
| Leng:yd | FUNC 01; 3; 12; × | |
| Leng:fathom | FUNC 01; 6; 12; × | |
| Leng:mile | FUNC 01; 5280; 12; × | |
| Leng:km | 1 | |
| Leng:mi | FUNC 01; 2.54; 12; ×; 5280; ×; 1e5; ÷ | Int Mile |
| Leng:us mi | 1.60934721869 | US Mile |
| Leng:nmi | 1.852 | Int Nautical mi |
| Leng:m | 0.001 | |
| Leng:ft | FUNC 01; 2.54; 12; ×; 1e5; ÷ | Intl Foot |
| Area:hectare | 1 | hectare |
| Area:acre | 0.40468564224 | Int Acre |
| Area:m^2 | 0.0001 | |
| Area:yd^2 | 8.36127360001e-5 | |
| Vol:l | 1 | |
| Vol:qt | 0.946352946 | US Lq Quart |
| Vol:gal | FUNC 01; 0.946352946; 4; × | US Lq Gal |
| Vol:cc | 0.001 | |
| Vol:butt | FUNC 01; 0.946352946; 4; ×; 126; × | US Butt 126 US Gal |
| Vol:bbutt | FUNC 01; 4.54609; 108; × | UK Butt 108 UK Gal |
| Vol:tsp | 1 | Teaspoon |
| Vol:tbsp | 3 | Tablespoon |
| Vol:flOZ | 6 | fl oz |
| Vol:cup | 48 | Cup |
| Vol:pint | 96 | Pint |
| Vol:qt | 192 | Quart |
| Time:sec | 1 | |
| Time:min | 60 | |
| Time:hour | 3600 | |
| Time:day | 86400 | |
| Time:week | 604800 | |
| Time:year | 31536000 | 365 day year |
| Time:day | 1 | |
| Time:year | 365 | Conentional |
| Time:acnt | 360 | Accounting |
| Time:greg | 365.2425 | Mean Gregorian |
| Time:julian | 365.25 | |
| Time:astro | 365.256363004 | Astronomical |
| Mass:kg | 1 | |
| Mass:lb | 0.45359237 | Pound Int |
| Mass:g | 1e3 | |
| Mass:ozWT | 28e3 | Ounce Food Weight |
| Mass:ozTr | 31.1034768e3 | Ounce Troy |
| Mass:stone | FUNC 01; 0.45359237; 14; × | Int Stone |
| Mass:lb | 1 | |
| Mass:US ton | 2000 | US (short) Ton |
| Mass:UK ton | 2240 | UK (long) Ton |
| Force:N | 1 | |
| Force:kgf | 9.80665 | |
| Force:lbf | FUNC 01; 0.45359237; 9.80665; × | Int lbf |
| Sped:m/s | 1 | |
| Sped:mph | FUNC 01; 2.54; 12; ×; 5280; ×; 1e2; ÷; 3600; ÷ | Int mph |
| Sped:kph | FUNC 01; 1000; 3600; ÷ | |
| Sped:knot | FUNC 01; 1.852; 1000; ×; 3600; ÷ | Intl nmi |
| Pres:Pa | 1 | N/m^2 |
| Pres:bar | 100000 | |
| Pres:psi | FUNC 01; 1e4; 0.45359237; ×; 9.80665; ×; 2.54; X^2; ÷ | |
| Pres:atm | 101325 | Standard |
| Pres:mmHg | 133.322 | |
| Pres:inHg | 3.386389e3 | Conventional |
| Powr:watt | 1 | |
| Powr:BTU/h | 0.2930710702 | International |
| Powr:hp | 735.49875 | Metric |
| Powr:kcal/h | 1.163 | |
| Temp:C→F | FUNC 11; 9; ×; 5; ÷; 32; + | |
| Temp:F→C | FUNC 11; 32; -; 5; ×; 9; ÷ | |
| Temp:K→C | FUNC 11; 273.15; - | |
| Temp:C→K | FUNC 11; 273.15; + | |
| ▒▒▒▒ | ||
| SIPFX | Run the SIPFX application |
3.2. Code
(MJR-generate-42-menu-code "UNIT" 0 tbl 0 nil 'stay ;; Change to 'exit to exit immediatly after a conversion factor is pushed to the stack 'up ;; Change to 'exit to have the application exit when [EXIT] is pressed 'yes (lambda (atrg row) (if (string-equal "SIPFX" atrg) (format "\"%s\"" atrg))) ;;#'MJR-local-only-gen-lab (lambda (atrg target row) (cl-destructuring-bind (menu cfactor desc) row (let ((print-desc 't)) ;; Set to NIL to not print description (let* ((dlen (length desc)) (dsc1 (if (> dlen 0) (substring desc 0 (min dlen 15)))) (dsc2 (if (> dlen 14) (substring desc 15 (min dlen 22))))) (mapconcat #'string-trim-left (cl-remove nil (flatten-list (list (split-string (message "%s" cfactor) ";") (and print-desc dsc1 (message "\"%s\"" dsc1)) (and print-desc dsc2 (message "├\"%s\"" dsc2)) (and print-desc (or dsc1 dsc2) "AVIEW")))) "\n"))))))
4. SI Prefixes
4.1. Generic
4.1.1. Menu
| Prefix | Sym | Val |
|---|---|---|
| centi | c | 1e-2 |
| milli | m | 1e-3 |
| micro | µ | 1e-6 |
| nano | n | 1e-9 |
| pico | p | 1e-12 |
| femto | f | 1e-15 |
| kilo | k | 1e+3 |
| mega | M | 1e+6 |
| giga | G | 1e+9 |
| tera | T | 1e+12 |
| peta | P | 1e+15 |
| exa | E | 1e+18 |
| kibi | Ki | 1024 |
| mebi | Mi | 1048576 |
| gibi | Gi | 1073741824 |
| tebi | Ti | 1099511627776 |
| pebi | Pi | 1125899906842624 |
| exbi | Ei | 1152921504606846976 |
Normally pressing the menu key will multiply the X value on the stack by the prefix multiplayer. If [SHIFT] is pressed befreo the menu key, then X will be
divided by the prefix mulitplyer.
4.1.2. Menu Code
Note: This one will have an END generated to finish the UNIT application.
(MJR-generate-42-menu-code "SIPFX" 0 tbl 0 nil 'stay ;; Change to 'exit to exit immediatly after a conversion factor is pushed to the stack 'up ;; Change to 'exit to have the application exit when [EXIT] is pressed 'no #'MJR-local-only-gen-lab (lambda (atrg target row) (cl-destructuring-bind (prefix-str sym-string mult) row (mapconcat #'string-trim-left (list (format "%s" mult) (format "FS? 64") (format "÷") (format "FC? 64") (format "×") (format "\"%s (%s)\"" prefix-str sym-string) ;;(format "AVIEW") ) "\n"))))
4.2. EE Prefixes
For EE problems a smaller set of prefixes is more efficient
4.2.1. Menu
| Prefix | Sym | Val |
|---|---|---|
| micro | µ | 1e-6 |
| nano | n | 1e-9 |
| pico | p | 1e-12 |
| ▒▒▒▒ | ||
| kilo | k | 1e+3 |
| mega | M | 1e+6 |
4.2.2. Menu Code
(MJR-generate-42-menu-code "EEPFX" 30 tbl 0 nil 'stay ;; Change to 'exit to exit immediatly after a conversion factor is pushed to the stack 'up ;; Change to 'exit to have the application exit when [EXIT] is pressed 'yes #'MJR-local-only-gen-lab (lambda (atrg target row) (cl-destructuring-bind (prefix-str sym-string mult) row (mapconcat #'string-trim-left (list (format "%s" mult) (format "FS? 64") (format "÷") (format "FC? 64") (format "×")) "\n"))))