Sha256: 8df7d36cf3d2c6dbad03ff86fe3812c12885d41e161857890320c97b8615ab0f
Contents?: true
Size: 580 Bytes
Versions: 5
Compression:
Stored size: 580 Bytes
Contents
module Misc
Log2Multiplier = 1.0 / Math.log(2.0)
def self.log2(x)
Math.log(x) * Log2Multiplier
end
def self.max(list)
max = nil
list.each do |v|
next if v.nil?
max = v if max.nil? or v > max
end
max
end
def self.sum(list)
list.compact.inject(0.0){|acc,e| acc += e}
end
def self.mean(list)
sum(list) / list.compact.length
end
def self.sd(list)
return nil if list.length < 3
mean = mean(list)
Math.sqrt(list.compact.inject(0.0){|acc,e| d = e - mean; acc += d * d}) / (list.compact.length - 1)
end
end
Version data entries
5 entries across 5 versions & 1 rubygems