Cluster numbers by their distance to each other

cluster.rb

values = 20.times.map{rand(100)+200}
delta = 10
min, max = values.minmax
offset = min - delta / 2
grouped = values.group_by { |value| (value - offset) / delta }
Hash[grouped.sort]



=begin
[1] pry(main)> values = 20.times.map{rand(100)+200}
=> [238,
 231,
 293,
 243,
 256,
 228,
 256,
 256,
 234,
 206,
 258,
 217,
 215,
 294,
 207,
 204,
 226,
 292,
 285,
 205]
[2] pry(main)> delta = 10
=> 10
[3] pry(main)> min, max = values.minmax
=> [204, 294]
[4] pry(main)> offset = min - delta / 2
=> 199
[5] pry(main)> grouped = values.group_by { |value| (value - offset) / delta }
=> {3=>[238, 231, 234],
 9=>[293, 294, 292],
 4=>[243],
 5=>[256, 256, 256, 258],
 2=>[228, 226],
 0=>[206, 207, 204, 205],
 1=>[217, 215],
 8=>[285]}
[6] pry(main)> Hash[grouped.sort]
=> {0=>[206, 207, 204, 205],
 1=>[217, 215],
 2=>[228, 226],
 3=>[238, 231, 234],
 4=>[243],
 5=>[256, 256, 256, 258],
 8=>[285],
 9=>[293, 294, 292]}
=end