13 lines
230 B
Ruby
13 lines
230 B
Ruby
class Array
|
|
def quadratic_mean
|
|
Math.sqrt( self.inject(0.0) {|s, y| s + y*y} / self.length )
|
|
end
|
|
end
|
|
|
|
class Range
|
|
def quadratic_mean
|
|
self.to_a.quadratic_mean
|
|
end
|
|
end
|
|
|
|
(1..10).quadratic_mean # => 6.2048368229954285
|