我需要Math.radians()函数,但找不到它。
radians=(angle/180)* Math::PI
我需要Math.radians()函数,但找不到它。
radians=(angle/180)* Math::PI
你可能想要在lib/目录中创建一个名为“mymath.rb”的文件,并像这样猴子补丁Math:
require mathn
module Math
def self.to_rad angle
angle / 180.0 * Math::PI
end
end
或者你可以像MBO在评论中所说的那样做。链接似乎无法访问,但是Google存档提供了这个信息丰富的小句子,它表明可能比我的解决方案更干净的解决方案(尽管我更喜欢在数学中保留数学内容)。
最简单的解决方案是在Numeric中定义一个转换方法,将角度数转换为弧度数。
作为说明,Ruby 2.0有一个称为“定义”的特征,基本上让你进行当地mon骑派。 它以这种方式开展工作(摘自,这个博客员额:
module RadiansConversion
refine Math do
def to_rad angle
angle / 180.0 * Math::PI
end
end
end
然后……它可以在另一个模块内或类似的任何地方使用。
module MyApp
using RadiansConversion
p Math.to_rad 180 #=> 3.14159265358979
p Math.to_rad 235 #=> 4.10152374218667
end
或者,你可以扩大Float,增加一至二 convert改:
class Float
def to_rad
self/180 * Math::PI
end
end
请用以下方式翻译:And use it like this。 并且像这样使用它。
radian=angle.to_rad
EDIT(通过表决): Sorry! 我回答时,我需要这样作,才能分享我发现的价值观。
所以,实际上就是:
x * (Math::PI / 180)
的中文翻译为:x * (数学::PI / 180)
。
我只是想展示我找到的一个执行方法。
# Geocoder::Calculations.to_radians(@geocode)
def to_radians(*args)
args = args.first if args.first.is_a?(Array)
if args.size == 1
args.first * (Math::PI / 180)
else
args.map{ |i| to_radians(i) }
end
end
将度数转换为弧度。如果传递了一个数组(或多个参数),则转换每个值并返回数组。
将此翻译成中文:http://rubydoc.info/github/alexreisner/geocoder/master/Geocoder/Calculations#to_radians-instance_method http://rubydoc.info/github/alexreisner/geocoder/master/Geocoder/Calculations#to_radians-instance_method
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