5分で分かる Measure

Measure Kenta Murata

Measure

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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#

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 => quot;1 [cm]quot;

irb(main):006:0> Measure.define_conversion :m, :cm => 100 irb(main):007:0> (Measure(1, :m) + Measure(1, :cm)).to_s => quot;1.01 [m]quot; 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 => quot;159.2 [mm]quot;

[in] [cm] [m] [mm]

irb(main):013:0> require 'measure/support' irb(main):014:0> Measure.form { 1.m - 1.cm }.to_s => quot;0.99 [m]quot;

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 => quot;-40.0 [deg_f]quot;

‣ measure/length require

‣ ‣ ‣ ‣ 1.kg.m.s(–2) ‣ ‣

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5分で分かる Measure

by Kenta Murata on Oct 25, 2008

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5分で分かる Measure — Presentation Transcript