RosettaCodeData/Task/Stem-and-leaf-plot/Ruby/stem-and-leaf-plot-1.rb

115 lines
2.5 KiB
Ruby

class StemLeafPlot
def initialize(data, options = {})
opts = {:leaf_digits => 1}.merge(options)
@leaf_digits = opts[:leaf_digits]
@multiplier = 10 ** @leaf_digits
@plot = generate_structure(data)
end
private
def generate_structure(data)
plot = Hash.new {|h,k| h[k] = []}
data.sort.each do |value|
stem, leaf = parse(value)
plot[stem] << leaf
end
plot
end
def parse(value)
stem, leaf = value.abs.divmod(@multiplier)
[Stem.get(stem, value), leaf.round]
end
public
def print
stem_width = Math.log10(@plot.keys.max_by {|s| s.value}.value).ceil + 1
Stem.get_range(@plot.keys).each do |stem|
leaves = @plot[stem].inject("") {|str,leaf| str << "%*d " % [@leaf_digits, leaf]}
puts "%*s | %s" % [stem_width, stem, leaves]
end
puts "key: 5|4=#{5 * @multiplier + 4}"
puts "leaf unit: 1"
puts "stem unit: #@multiplier"
end
end
class Stem
@@cache = {}
def self.get(stem_value, datum)
sign = datum < 0 ? :- : :+
cache(stem_value, sign)
end
private
def self.cache(value, sign)
if @@cache[[value, sign]].nil?
@@cache[[value, sign]] = self.new(value, sign)
end
@@cache[[value, sign]]
end
def initialize(value, sign)
@value = value
@sign = sign
end
public
attr_accessor :value, :sign
def negative?
@sign == :-
end
def <=>(other)
if self.negative?
if other.negative?
other.value <=> self.value
else
-1
end
else
if other.negative?
1
else
self.value <=> other.value
end
end
end
def to_s
"%s%d" % [(self.negative? ? '-' : ' '), @value]
end
def self.get_range(array_of_stems)
min, max = array_of_stems.minmax
if min.negative?
if max.negative?
min.value.downto(max.value).collect {|n| cache(n, :-)}
else
min.value.downto(0).collect {|n| cache(n, :-)} + 0.upto(max.value).collect {|n| cache(n, :+)}
end
else
min.value.upto(max.value).collect {|n| cache(n, :+)}
end
end
end
data = DATA.read.split.map {|s| Float(s)}
StemLeafPlot.new(data).print
__END__
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