Mathpad: A mathematical keypad for students and professionals

by todsacerdoti • 1 year ago

126 38 1 year ago

eviks• 1 year ago

Interesting idea! Though since it doesn't have a more ergonomic keypad-like layout, but repeats the slanted mistake of default keyboards, and requires software companion, what's the advantage over adding math layers to your current keyboard, where you also have access to more keys and modifiers?

asdf_snar• 1 year ago

Seconded. This looks like a fun toy, but it solves a problem that I don't have (and I believe I am the target audience). Modern typesetters are very good (e.g., TexMacs). There is also a limited set of characters by design, and I would have to remove my hand from my keyboard only for those.

ubj• 1 year ago

Love this idea, although I wonder if this can also be done with QMK keyboards. I'll have to try setting up similar macros in my Ergodox EZ.

WillAdams• 1 year ago

Interesting idea, but back when I needed to enter such I use DEC's compose.exe (while it still worked) and then Allchars:

https://sourceforge.net/projects/allchars/

or used a stylus and the drawing input in TeXview.app on my NeXT Cube or https://www.inftyproject.org/en/software.html --- since then, didn't Microsoft's Journal and various other stylus note-taking apps get math support?

These days I just press the touch keyboard icon in the task bar and use that to get special characters.

A further concern is one has to be entering things more than just as a lineal stream --- superscripts and subscripts need to be entered into, things need to be put over or under a fraction bar, &c. --- do the hard-wired buttons actually accelerate things that much?

Why not just use a programmable keypad such as a Streamdeck?

dr_kiszonka• 1 year ago

I love the idea of a physical device (esp. with buttons) but I get that it is not always practical. I wonder how much work it would take to add math symbols to something like Touch Portal. I haven't used it but read that many people do for controlling various software, including DAWs (which can be latency-sensitive).

https://www.touch-portal.com/

layer83• 1 year ago

WinCompose [0] is the spiritual successor to AllChars.

[0] https://github.com/samhocevar/wincompose

threatofrain• 1 year ago

Y’all should try espanso for your latex needs.

JadeNB2• 1 year ago

Y’all should try espanso for your latex needs.

I definitely understand why macro-expander programs can be useful, but I'm always a bit puzzled about the idea of combining them with a macro language like (La)TeX. Why introduce two layers of macro indirection? Maybe it just doesn't fit my use case, which doesn't mean it can't fit anybody's; but, more intriguingly, maybe it would come to fit my use case if I understood what it can add, so I wonder if you could describe how it's useful to you.

red_admiral• 1 year ago

Why introduce two layers of macro indirection

TeX already has more than enough layers of macro indirection :/

Try debugging an \makeatletter\expandafter and you're going to have a bad day. I think the macro system is even Turing-complete in some sense, certainly the number of times you potentially need to run TeX to guarantee a complete output reduces to the halting problem.

stevejb• 1 year ago

This is super cool. When I was doing a lot of math-related typesetting I found that I got really fast with Emacs + AuCTeX. I have no idea of the state of that project, but if you were fast you go at nearly the speed at which you could write.

altairprime• 1 year ago

For those interested in purchase rather than DIY, the above page links to:

https://www.crowdsupply.com/summa-cogni/mathpad

zokier• 1 year ago

it is frustrating that nowhere does it tell how it actually works. generally keyboards can not send specific unicode codepoints to host system, they only send scancodes that get interpreted by operating systems keymap. But most keymaps do not define any keys for these symbols, so there is something going on here. Based on the docs, I'll guess it attempts to send a sequence of keypresses to trigger some compose mode (thus requiring additional software on windows). I find such hacks slightly frustrating because they are so fragile, they depend on the keyboard predicting perfectly how the host will handle the keypress sequences which obviously can break quite easily, e.g. simply by switching layouts or having some timing/focus related aspects.

I would really love to see new keyboard HID designed specifically for modern advanced keyboards (qmk etc) where you wouldn't need to resort on this kind of trickery. Or alternatively make the input stacks of OSs more easily configurable with custom physical layouts and modifiers etc instead of assuming that all keyboards follow basic ISO/ANSI layout.

a5c112• 1 year ago

Maybe it's as simple as sending popular ALT+<unicode> sequence, at least for Windows and Linux. But that's still hacky.

a5c112• 1 year ago

Ya, I was right. The driver is built around popular QMK framework. Here you can read how it handles unicode input: https://docs.qmk.fm/features/unicode.

glitchc• 1 year ago

It's likely the driver handling the conversion. Which makes me wonder, can I use the same driver to remap extra keys on my existing QMK compatible keyboard?

agcat• 1 year ago

This is pretty cool!

genpfault• 1 year ago

Prior art: https://en.wikipedia.org/wiki/Space-cadet_keyboard

RachelF• 1 year ago

Or the ZX Spectrum keyboard

https://www.retrotechlab.com/wp-content/uploads/2020/01/Sinc...

mcphage• 1 year ago

Why no Aleph?!

layer83• 1 year ago

To infinity and beyond!

efavdb• 1 year ago

Why no omicron!?

challenger-derp• 1 year ago

Am eagerly anticipating the commercial availability of Mathpad.

At the moment I'm using Espanso, an open source software that lets users map typed character sequences to unicode. So it's possible to set things up in such a way that typing the character sequence ";" "a" ";" makes Espanso replace the entire ;a; string with the greek symbol alpha α.

Symbols like ⇒ that can kind of be "drawn" with common keyboard characters "=" ">" is possibly nice to be mapped to the character sequence ;=>; This is a personal preference inspired by Typst's math notation design choice.

IngoBlechschmid• 1 year ago

I like Vim's digraphs, which go in a similar direction. For instance, Ctrl-K = > gives ⇒, Ctrl-K a * gives α. An overview of available digraphs is available at :digraphs.

Otherwise I like the Agda input method of Emacs, where \to gives ⇒ and \alpha (or \Ga) gives α.

JNRowe• 1 year ago

Somewhat predictably zsh also has a digraphs¹ feature, via the insert-composed-char function². Supported characters can be seen in source³, and beyond that there is the insert-unicode-char² function for when you need it.

I flit between regular compose key input and zsh/vim digraphs in a way that makes no sense to me whatsoever. Compose ^1, AltGr+1 or C-k 1S all kind of feel natural to me, but the advantage of the ZLE method is that you can also use it to preview characters which can be useful if you want to test something out while in another widget or find the hex value to insert using some other tool.

¹ https://datatracker.ietf.org/doc/html/rfc1345#section-2.3

² https://zsh.sourceforge.io/Doc/Release/User-Contributions.ht...

³ https://github.com/zsh-users/zsh/blob/master/Functions/Zle/d...

layer83• 1 year ago

I prefer using a Compose key [0] (remapped Caps Lock, for me), which can be installed/configured on all major platforms. Configuration is sharable via XCompose configuration files.

[0] https://en.wikipedia.org/wiki/Compose_key

Unearned5161• 1 year ago

It looks nice, but I'm not sure I'd jump ship from my snippets setup I have with vim. At the end of the day it would be very similar to a mouse hand movement and would probably take a long time to get it as quick and comfortable as just typing "aa" for alpha when I'm in math mode which I get into with "mk"

blagie• 1 year ago

I'd pay money for one of these, if it had the keys which I want, which this one doesn't. I think the trick would be to somehow make it customizable, but I'm not sure the best way to do that. Parametrized PCB design? 3d printing?

I'm not quite sure, but my dream would be smaller buttons, coarsely modelled on the HP48-style keypad. I can't imagine many people share that dream, but I've wanted to make that for a long, long time.

Coincidentally, you get a long ways there by simple adding a Greek keyboard layout. You hit meta-space, and ασδζχψ. meta-space, and back to normal.

Foreign-language keyboard under GNU/Linux also have a layer with many convenient math keys (²·≈·¾ all exist natively in my normal layout).

A smaller win for me would be to simply print all of that on my keycaps.

hamaluik• 1 year ago

You should try building one for yourself, I did [1] and it’s easier than you’d think. I made mine just a basic numpad but I really like the idea of turning it into a tool to enter math symbols.. guess I know what my next project is, thanks for the inspiration!

1: https://blog.hamaluik.ca/posts/custom-numpad/

paradox460• 1 year ago

You could go with a streamdeck and make your own set of bindings. Has the advantage that each key on it is a screen, so it can change for context

mkl• 1 year ago

This one is customisable. The firmware uses QMK, so you can remap it however you like. You'd need to make some key label stickers in Inkscape or something if you want the keys to show the characters.

charlieyu1• 1 year ago

I bought a 25 key pad that is collecting dust. Not worth it for me to have an extra keyboard taking up space on my desk, may as well use LaTeX or alt codes

codethief• 1 year ago

I have rofimoji[0] bound to a key chord in i3wm and configured it in such a way that it allows me to enter not just the usual emojis but also common math symbols. Works like a charm!

[0] https://github.com/fdw/rofimoji

ggm• 1 year ago

Briefly there was an IPv6 numpad: it had 0-9 and A-F on it for typing "Hex"

gtani• 1 year ago

Not bad, curious about price, but as noted by others in thread, the only really special thing are the keycaps, given those you could replicate functionality on any ZMK/QMK keyboard. I might try this as a layer of a glove 80 or ZSA voyager, s.t. like that

pimlottc• 1 year ago

As a red-green colorblind person, I find it hard to distinguish the colors of the R and C keys

spartanatreyu• 1 year ago

Those colors were poorly chosen. Going through the accessibility checker in the browser's dev tools, at least two of the 3 colored buttons are always indistinguishable.

For anyone who needs it:

The bottom row has two buttons that are 1.5 times standard width keys, the left is mauve (light pinkish-purple), the right is a minty-green.

The second bottom row has five standard keys but the far left one is unlabelled and coloured light-blue.

Each labelled key has 6 symbols in a 2x3 layout.

By default, pressing a key will type the symbol in the top row and left column.

Holding the mauve key when typing will change all keys to use the centre row.

Holding the minty-green key when typing will change all keys to use the bottom row.

Holding the light-blue key when typing will change all keys to use the right column.

So any combination of no-modifiers, right-column, middle-row, or bottom-row modifier keys when pressing a key can select any symbol on the keyboard.

I have no idea what happens when pressing a key while holding both the middle-row and bottom-row modifiers at the same time.

Those modifier keys definitely should have had symbols on them showing which row/column they modify.

dgfl• 1 year ago

I use qwerty-fr [0] for this. It's pretty nice, since it works on all three major OSes and is basically a few compose layers on top of a US base layout. I use it to type greek letters, swedish vowels, italian accents and math symbols. A couple of non-breaking spaces are also there. It's the only layout I use nowadays.

[0] https://qwerty-fr.org/

Mathpad: A mathematical keypad for students and professionals

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