UnitSystems.jl
pqm
UnitSystems.jl | pqm | |
---|---|---|
6 | 3 | |
11 | 15 | |
- | - | |
0.0 | 1.3 | |
over 1 year ago | about 1 year ago | |
Julia | JavaScript | |
MIT License | MIT License |
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UnitSystems.jl
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UnitSystems.jl vs Unitful.jl
[UnitSystems.jl](https://github.com/chakravala/UnitSystems.jl) and Unitful.jl are both Julia packages that provide support for working with physical quantities and units of measurement. However, there are some differences between the two packages:
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rounding in julia is incorrect
however, the correct solution would be for round to just work correctly instead of me writing extra methods for my packages https://geophysics.crucialflow.com/dev/units
- Similitude.jl is new more powerful Quantity than Unitful.jl
- Unitsystems.jl (complete reference for Physics Conversions)
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GNU Units
Recently I created a library for unit conversion in Julia, which is the most complete tool for unit conversion I am currently aware of
https://github.com/chakravala/UnitSystems.jl
pqm
- A better/faster JavaScript library for physical math
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Ask HN: Show your failed projects and share a lesson you learned
I made a spreadsheet add-on similar to the pint library for python (dimensional analysis) based on my own open source JS library (https://github.com/GhostWrench/pqm). Website is still up: https://ghostwrench.net/convertplus.html.
To me it seemed like the perfect way to get a solo app up and running because Google was going to run all the sever stuff and I could just cash in. The app never really got off the ground and by the time I realized that Big G really doesn’t want to make it easy for any schmuck to run a profit generating app using their servers and their technology and it wasn’t worth the maintenance effort to keep up with the constant requests to update the app. I think it is no longer available on the GSuite store as of a few months ago. I think my biggest mistakes were as follows:
1) I needed a business/marketing oriented co-founder. I underestimated how difficult that job is and overestimated my ability to do it.
2) I wanted to charge too much for the app. I didn’t want to undersell myself and get caught in a trap of not making enough to keep up with maintenance. I went too far the other way. I think maybe a $50-$60 on time charge would have been appropriate, instead of requiring a subscription. This is an easy fix, but I would had to re-do my marketing effort and see #1
3) Built before I tested the market. I convinced myself that just asking a few of my engineering friend would use it was enough. Again, this is probably a symptom of #1
4) I was mentally unprepared to deal with failure and I lost motivation to keep working on the project when things didn’t go as I expected.
5) I underestimated how much people actually use spreasheet add-ons. There really isn’t a thriving market and most of the really popular apps are a utility attached to another popular standalone project.
6) Probably should have targeted Excel rather than Sheets, because the market is simply bigger.
I think if the stars align, I would like to give this project another go. I don’t think it has totally failed rather than just gone dormant, but I need a better strategy for round 2!
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GNU Units
There are heaps of libraries for all languages because it is a fairly fun and straight forward project. I personally created this one because I was frustrated with how slow and clunky the existing javascript libraries were:
https://github.com/GhostWrench/pqm
Also, I open sourced just the unit database (in JSON format) for anyone interested in making their own version:
https://github.com/GhostWrench/unitdb
What are some alternatives?
gnu-units - GNU Units (mirror)
unix-v6 - UNIX 6th Edition Kernel Source Code
Unitful.jl - Physical quantities with arbitrary units
Ruby Units - A unit handling library for ruby
lasercrabs - Abandoned hybrid singleplayer/multiplayer shooter project formerly known as DECEIVER
boltstream - Boltstream Live Video Streaming Website + Backend
mathics-core - An open-source Mathematica. This repository contains the Python modules for WL Built-in functions, variables, core primitives, e.g. Symbol, a parser to create Expressions, and an evaluator to execute them.
uom - Units of measurement -- type-safe zero-cost dimensional analysis