在Ruby中转换物理单位(千克,磅)的图书馆？

哇,还有比我预想的还要多一些.这是我认为是一个完整的列表,按字母顺序,从他们的文档中删除示例使用.我也注意到我是否无法让他们在本地运行.

> Alchemist

require 'alchemist'
Alchemist.setup
8.miles.to.meters
10.kilometers + 1.mile # 11.609344 kilometers

> measurement

这一次出现过时了,最后一次提交是5年前,对我来说似乎没有运行在1.9.3.

include Measurement::Length
Inch.new(12).to_centimeters # => #<Measurement::Length::Centimeter:0x173c2b4 @units=30.48>

> Phys-Units

require "phys/units"
Q = Phys::Quantity
U = Phys::Unit

Q[1.23,'km'] + Q[4.56,'m']    #=> Phys::Quantity[1.23456,'km']
Q[123,'mile'] / Q[2,'hr']     #=> Phys::Quantity[61,'mile/hr']
Q[61,'miles/hr'].want('m/s')  #=> Phys::Quantity[27.26944,'m/s']
Q[1.0,'are'] == Q[10,'m']**2  #=> true

> Quantity

请注意,这个说明README中没有生产就绪.

require 'quantity/all'
1.meter                                         #=> 1 meter
1.meter.to_feet                                 #=> 3.28083... foot
c = 299792458.meters / 1.second                 #=> 299792458 meter/second

newton = 1.meter * 1.kilogram / 1.second**2     #=> 1 meter*kilogram/second^2
newton.to_feet                                  #=> 3.28083989501312 foot*kilogram/second^2
newton.convert(:feet)                                   #=> 3.28083989501312 foot*kilogram/second^2
jerk_newton = newton / 1.second                         #=> 1 meter*kilogram/second^3
jerk_newton * 1.second == newton                        #=> true

> SY

见Boris Stitnickey’s answer.
> ruby-measurement

require 'ruby-measurement'

measurement = Measurement.parse('3 feet')  # => 3.0 ft.
measurement.convert_to(:yards)             # => 1.0 yd.
measurement.convert_to(:in)                # => 36.0 in.
measurement.convert_to(:inches)            # => 36.0 in.

measurement1 = Measurement.parse('3 feet') # => 3.0 ft.
measurement2 = Measurement.parse('6 inch') # => 6.0 in.
measurement1 + measurement2                # => 3.5 ft.

> ruby-units

require 'ruby-units'

unit = Unit("mm")                # unit only (defaults to a scalar of 1)
unit = Unit("1 mm")              # create a simple unit
unit = Unit("1 kg*m^2/s^2")      # complex unit

unit1 =~ unit2                   # true if units are compatible
unit1.compatible?(unit2)         # true if units are compatible

unit1 = unit >> "ft"             # convert to 'feet'
unit3 = unit1 + unit2            # resulting object will have the units of unit1

unit1 === unit2                  # true if units and quantity are the same,even if 'equivalent' by <=>
unit.convert_to('ft')            # convert
(unit1 + unit2).convert_to('ft') # converts result to 'ft'

> Units for Ruby

require 'units'

three_meters = 3.meters
two_meters = 2.m
one_inch = 1.inch

3.meters.to_inches # => 118.1103 inch
10.inches.to_mm    # => 254.0 millimeter

> Unitwise

require 'unitwise/ext'

1.yard == (1.foot * 3)                       # => true

1.quart < 1.liter                            # => true

2.meter + 3.inch - 1.yard                    # => <Unitwise::Measurement 1.1618 meter>

1.convert_to('kg.m2/s2') == 1.joule          # => true

(20.kg * 9.8.convert_to('m/s2')).to_pound_force # => <Unitwise::Measurement 44.06255284754326 pound_force>

(300.horsepower * 60.second).to_calorie      # => <Unitwise::Measurement 3208077.8414151203 calorie>

> Van/Unit

像另一张海报,我有麻烦让这个工作.但是,您可以看到J?rg W Mittag’s answer的使用.

作为Unitwise的作者,很明显,这是我最喜欢的.我鼓励你至少检查一下.