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Top 23 Unit Open-Source Projects
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numbat
A statically typed programming language for scientific computations with first class support for physical dimensions and units
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SI
A header only C++ library that provides type safety and user defined literals for physical units (by bernedom)
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au
A C++14-compatible physical units library with no dependencies and a single-file delivery option. Emphasis on safety, accessibility, performance, and developer experience. (by aurora-opensource)
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desktop
Next generation notepad-based calculator, built with extendibility and privacy in mind. (by parsify-dev)
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Project mention: Show HN: Heynote – A Dedicated Scratchpad for Developers | news.ycombinator.com | 2023-12-22The Math blocks are powered by Math.js (https://mathjs.org/).
Project mention: Show HN: Numbat – A programming language with physical dimensions as types | news.ycombinator.com | 2023-11-16Apparently this replaces https://github.com/sharkdp/insect
Only tangential to this but somebody might find it usefull. I’m doing lots of calculations in Python involving various units. I’m using a similar library called Pint. https://github.com/hgrecco/pint
My business is thermodynamics of power plants. Professionals in the industry tend to use convenient units like C, bars, kJ/kg and so on. But the formulas usualy need basic SI units.
If engineering/scientific projects appeal to you, Units of measurement implementations for Java are woefully behind when compared with the likes of UnitsNet for C#.
Project mention: Is it just mean, or is C# easier to learn than JavaScript or even PHP? | /r/dotnet | 2023-12-06It's not the type system you're complaining about, though. It takes a bit of work but you can write types that include units information with no loss of performance.
Project mention: Show HN: Numbat – A programming language with physical dimensions as types | news.ycombinator.com | 2023-11-16> 365·243 ought to be 365·2425 exactly:
Yes. This is also how it is defined: https://github.com/sharkdp/numbat/blob/ba9e97b1fbf6353d24695...
The calculation above is showing a rounded result (6 significant digits by default).
Project mention: Frink is a programming language designed to make physical calculations simple | news.ycombinator.com | 2023-11-03
Project mention: Frink is a programming language designed to make physical calculations simple | news.ycombinator.com | 2023-11-03Rust as well. There are at least a few libraries to do it, but I'll link the one I wrote:
https://crates.io/crates/dimensioned
JSR 385 reference implementation Indriya - https://github.com/unitsofmeasurement/indriya
Anything with a finite (200 is small even) number of units misses the algebraic structure of the problem mentioned in https://news.ycombinator.com/item?id=36988497 wherein multiplying|dividing two things gives you a (potentially) new unit which implies an open ended "space" of units.
To be concrete (hah!), in C++ a template meta-type with 12 signed integer parameters (6 numerators & 6 denominators for rational exponents of SI base units) might be one way to model it.
Unlike C++ template stuff, Nim macros (like Lisp macros) makes metaprogramming more like procedural programming - just against abstract syntax trees. I think that helps to shield some of this type complexity from users, but the documentation README https://github.com/SciNim/Unchained does better job than I can in an HN comment.
Of course, for unit system conversion, the number of dimensions (6 in SI, 3 in CGS/Gaussian) changes. So, for full generality you need compile-time (if you want static type integration/CT errors) linear algebra over a rational field (at least & conventionally) to project|inverse project. That might be theoretically possible in C++. I would think it very un-fun and unlikely to ever have been done. There's probably a Mathematica package, though.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Units related posts
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Is it just mean, or is C# easier to learn than JavaScript or even PHP?
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Show HN: Numbat – A programming language with physical dimensions as types
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Frink is a programming language designed to make physical calculations simple
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What Is Dimensional Analysis?
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GNU Units
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All I can say is that I relate, very much
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Are there any languages that allow units?
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A note from our sponsor - InfluxDB
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Index
What are some of the best open-source Unit projects? This list will help you:
| Project | Stars | |
|---|---|---|
| 1 | mathjs | 14,043 |
| 2 | insect | 3,151 |
| 3 | pint | 2,271 |
| 4 | UnitsNet | 2,136 |
| 5 | mp-units | 950 |
| 6 | numbat | 849 |
| 7 | Unitful.jl | 575 |
| 8 | SI | 482 |
| 9 | rink-rs | 396 |
| 10 | jsr354-api | 346 |
| 11 | dimensioned | 293 |
| 12 | au | 279 |
| 13 | desktop | 203 |
| 14 | safe-units | 200 |
| 15 | coulomb | 140 |
| 16 | measured | 117 |
| 17 | cpc | 114 |
| 18 | indriya | 111 |
| 19 | Unchained | 106 |
| 20 | Unity-RTS-Selection | 74 |
| 21 | php-unit-conversion | 65 |
| 22 | membrain | 61 |
| 23 | broch | 52 |
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