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Contents
class Numeric
# Conceptually, rounding is expected to apply to floating point numbers.
# However it can actually be applied to pretty much any Numeric object.
# For example, one could round an Integer to the nearest kilo.
#
# See Float#round_at.
def round_at(*args)
to_f.round_at(*args)
end
# See Float#round_to.
def round_to(*args)
to_f.round_to(*args)
end
end
=begin
class Integer
# See Float#round_at.
def round_at(*args)
to_f.round_at(*args)
end
# See Float#round_to.
def round_to(*args)
to_f.round_to(*args)
end
end
=end
class Float
# Rounds to the given decimal position.
#
# 4.555.round_at(0) #=> 5.0
# 4.555.round_at(1) #=> 4.6
# 4.555.round_at(2) #=> 4.56
# 4.555.round_at(3) #=> 4.555
#
# CREDIT: Trans
def round_at( d ) #d=0
(self * (10.0 ** d)).round.to_f / (10.0 ** d)
end
# Rounds to the nearest _n_th degree.
#
# 4.555.round_to(1) #=> 5.0
# 4.555.round_to(0.1) #=> 4.6
# 4.555.round_to(0.01) #=> 4.56
# 4.555.round_to(0) #=> 4.555
#
# CREDIT: Trans
def round_to( n ) #n=1
return self if n == 0
(self * (1.0 / n)).round.to_f / (1.0 / n)
end
end
Version data entries
7 entries across 6 versions & 1 rubygems