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Contents
module Picky
module Generators
module Weights
# Uses a logarithmic weight.
# If for a key k we have x ids, the weight is:
# w(x): log(x)
# Special case: If x < 1, then we use 0.
#
class Logarithmic < Strategy
# Sets the weight value.
#
# If the size is 0 or one, we would get -Infinity or 0.0.
# Thus we do not set a value if there is just one. The default, dynamically, is 0.
#
# BUT: We need the value, even if 0. To designate that there is a weight!
#
def weight_for amount
return 0 if amount < 1
Math.log(amount).round 3
end
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems