Measure 単位付き数値ライブラリ
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Measure単位付き数値ライブラリ村田 賢太Ruby 札幌
Ruby 勉強会@札幌‒092008‒08‒23
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単位付き数値とは?
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単位付き数値とは?
✓173 [cm]
✓63 [kg]
✓376.730 [Ω]
✓101,325 [Pa]
✓1.602×10‒19 [C]
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Measure ライブラリ
✓単位付き数値クラスを提供
✓異なる単位間の変換を定義可能
✓単位付き数値の簡易記法を提供
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インストール方法mrkn-macbook:~ root# gem install -r measure
Bulk updating Gem source index for: http://gems.rubyforge.org
Successfully installed measure-0.1.0
1 gem installed
Installing ri documentation for measure-0.1.0...
Installing RDoc documentation for measure-0.1.0...
mrkn-macbook:~ root#
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使い方mrkn-macbook:~ root# irb
irb(main):001:0> require 'measure'
irb(main):002:0> Measure.define_unit :m, :length
irb(main):003:0> Measure.define_unit :cm, :length
irb(main):004:0> Measure(1, :m)
=> #<Measure:0x57d8c @unit=:m, @value=1>
irb(main):005:0> Measure(1, :cm).to_s
=> "1 [cm]"
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単位変換irb(main):006:0> Measure.define_conversion :m, :cm => 100
irb(main):007:0> (Measure(1, :m) + Measure(1, :cm)).to_s
=> "1.01 [m]"
irb(main):008:0> Measure.define_unit :in, :length
irb(main):009:0> Measure.define_conversion :in, :cm => 2.54
irb(main):010:0> Measure.define_unit :mm, :length
irb(main):011:0> Measure.define_conversion :m, :mm => 1000
irb(main):012:0> (Measure(210, :mm) - 2*Measure(1, :in)).to_s
=> "159.2 [mm]"
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マルチホップ変換[in] [cm]
[mm]
[m]
2.54倍
100倍
1000倍
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マルチホップ変換[in] [cm]
[mm]
[m]
2.54倍
100倍
1000倍
2.54分の1
100分の1
1000倍
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マルチホップ変換[in] [cm]
[mm]
[m]
2.54倍
100倍
1000倍
2.54分の1
100分の1
1000倍連結な単位間での相互変換の経路を幅優先探索で発見
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簡易記法irb(main):013:0> require 'measure/support'
irb(main):014:0> Measure.form { 1.m - 1.cm }.to_s
=> "0.99 [m]"
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定義済み単位✓measure/length を require すると次の単位が定義され相互変換可能な状態になる
m, meter in, inch pt, point, dp, didot_pointcm, centi_meter ft, feet bp, big_pointmm, milli_meter yd, yard pc, picakm, kilo_meterum, micro_meternm, nano_meter
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未対応な機能✓多次元単位
✓たとえば 1 [kg m / s2] など
✓簡易記法なら 1.kg.m.s(‒2) かな?
✓スケーリング以外の単位変換
✓[°C] = 5×([°F] ‒ 32) / 9 など
✓開発版では対応済み10
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Proc による単位変換irb(main):015:0> Measure.define_unit :deg_c, :temperature
irb(main):016:0> Measure.define_unit :deg_f, :temperature
irb(main):017:0> Measure.define_conversion :deg_c, :deg_f => lambda
{|x| 9.0*x/5.0 + 32 }
irb(main):018:0> Measure.define_conversion :deg_f, :deg_c => lambda
{|x| 5.0*(x - 32)/9.0 }
irb(main):019:0> Measure.form { -40.deg_c.as_deg_f }.to_s
=> "-40.0 [deg_f]"
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Future works
✓スケーリング以外の変換を実装したバージョンをリリースする
✓定義済み単位を増やす
✓多次元単位への対応
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