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Random number generator with Benford's law distribution, fmi see https://en.wikipedia.org/wiki/Benford%27s_law and https://rosettacode.org/wiki/Benford%27s_law#Ruby
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| r=rand;(1..9).map{|n|Math.log10(1+1.0/n)}.inject([]){|a,e|a+[(a[-1]||0)+e]}.map.with_index{|p,i|[i+1,p]}.find{r<_2}[0] |
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| 100000.times.map{r=rand;(1..9).map{|n|Math.log10(1+1.0/n)}.inject([]){|a,e|a+[(a[-1]||0)+e]}.map.with_index{|p,i|[i+1,p]}.find{r<_2}[0]}.inject(Hash.new(0)) { |total, e| total[e] += 1 ;total}.sort_by(&:last) | |
| # => [[9, 4535], [8, 5072], [7, 5932], [6, 6743], [5, 7801], [4, 9702], [3, 12667], [2, 17494], [1, 30054]] |
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