module ArrayFastMethods
Constants
- VERSION
Public Instance Methods
mean()
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# File lib/array_fast_methods.rb, line 4 def mean (sum.to_f / size.to_f) end
std_dev()
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# File lib/array_fast_methods.rb, line 15 def std_dev Math.sqrt(variance) end
variance()
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# File lib/array_fast_methods.rb, line 8 def variance m = mean sum_let = 0.0 each {|v| sum_let += (v-m)**2 } sum_let/size end