From: 7stud -- <bbxx789_05ss@...>
Date: 2011-07-15T19:52:42+09:00
Subject: Re: Elegant selection of closest number?

Philip Rhoades wrote in post #1010919:
> People,

buckets = [
  0.1,
  0.2,
  0.3,
  0.4,
  0.5,
]

data = [
  0.00,
  0.14,
  0.19,
  0.24,
  0.25,
  0.41,
  1.00,
]

results = Hash.new {|hash, key| hash[key] = []}

data.each do |num|
  rounded = num.round(1)

  first = buckets.first
  last = buckets.last

  if rounded < first
    results[first] << num
  elsif rounded > last
    results[last] << num
  else
    results[rounded] << num
  end
end

p results

--output:--
{0.1=>[0.0, 0.14], 0.2=>[0.19, 0.24], 0.3=>[0.25], 0.4=>[0.41], 
0.5=>[1.0]}

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