Fix Imperial units - Githubissues

goldfirere commented 10 years ago

There is some work to do to make imperial units releasable:

How inclusive should we be? Are these standardized anywhere?
How to differentiate between US measures and UK measures, where they differ?
How to convert between grams and pounds? They don't measure the same thing!

goldfirere commented 10 years ago

I will say that there's a part of me that thinks imperial units should be released separately from the units package. Few people will use it, I think.

gambogi commented 10 years ago

So, I am currently working on a project that will definitely be using both SI and Imperial units, and I would naturally prefer to have Imperial included in the package. Just my two cents, really like what you've done here

TravisWhitaker commented 10 years ago

AFAIK the single point of truth for Imperial units is the Weights of Measures Act of 1824 and its subsequent amendments. Grams are convertible to Slugs, and Pounds are convertible to Newtons [(kg*m)/s^2].

nushio3 commented 10 years ago

Hi, I'm glad that there're interested users to units library!

How inclusive should we be? Are these standardized anywhere?

I guess the original idea was that units library support only Nondimensional unit by default https://github.com/goldfirere/units/blob/master/README.md and separate any concrete units to another library, say units-extras or units-units.

Or, we can keep the SI unit in units given their standardness, and put other units as well as extra dimensions (say, angles, bits, manpower etc... ) to the extra.

Does anyone have any idea about the name and the separation line for the new library? See also #4

How to differentiate between US measures and UK measures, where they differ?

I wasn't aware of 1824 Act. Thank you Travis! I have been referring the wikipedia articles:

http://en.wikipedia.org/wiki/Imperial_units http://en.wikipedia.org/wiki/United_States_customary_units

I'm thinking of creating Data.Dimensions.Imperial.* and Data.Dimensions.US.*

How to convert between grams and pounds? They don't measure the same thing!

I'm thinking of introducing two distinguished units.

http://en.wikipedia.org/wiki/Pound-mass http://en.wikipedia.org/wiki/Pound-force

gambogi commented 10 years ago

I think it would make the most sense to include Data.Dimensions.SI in the standardunits library. If US or UK are desired units-extra should have UK and US. The reasoning being that all of these units should be convertible, and having the SI types as the universal go between would be a decent choice.

goldfirere commented 10 years ago

That's basically my thought, too -- having a universal lingua franca will help build more libraries out from this.

goldfirere commented 10 years ago

After some debate, Takayuki and I agreed to move all systems definitions out of the core package, and into a separate package units-defs. Closing this ticket here and opening one there...

nushio3 commented 10 years ago

Roger that!

2014-04-16 12:19 GMT+09:00 Richard Eisenberg notifications@github.com:

After some debate, Takayuki and I agreed to move all systems definitions out of the core package, and into a separate package units-defs. Closing this ticket here and opening one there...

— Reply to this email directly or view it on GitHubhttps://github.com/goldfirere/units/issues/3#issuecomment-40559143 .

goldfirere / units

Fix Imperial units #3