Class: MoreMath::Histogram

Inherits:
Object show all
Defined in:
lib/more_math/histogram.rb

Overview

A histogram gives an overview of a sequence’s elements.

Defined Under Namespace

Classes: Bin

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sequence, bins = 10) ⇒ Histogram

Create a Histogram for the elements of sequence with bins bins.



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# File 'lib/more_math/histogram.rb', line 7

def initialize(sequence, bins = 10)
  @sequence = sequence
  @bins = bins
  @result = compute
end

Instance Attribute Details

#bins ⇒ Object (readonly)

Number of bins for this Histogram.



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# File 'lib/more_math/histogram.rb', line 14

def bins
  @bins
end

Instance Method Details

#counts ⇒ Object 



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# File 'lib/more_math/histogram.rb', line 25

def counts
  each_bin.map(&:count)
end

#display(output = $stdout, width = 50) ⇒ Object

Display this histogram to output, width is the parameter for prepare_display



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# File 'lib/more_math/histogram.rb', line 31

def display(output = $stdout, width = 50)
  d = prepare_display(width)
  for l, bar, r in d
    output << "%11.5f -|%s\n" % [ (l + r) / 2.0, "*" * bar ]
  end
  output << "max_count=#{max_count}\n"
  self
end

#each_bin(&block) ⇒ Object 



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# File 'lib/more_math/histogram.rb', line 21

def each_bin(&block)
  @result.each(&block)
end

#max_count ⇒ Object 



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# File 'lib/more_math/histogram.rb', line 40

def max_count
  counts.max
end

#to_a ⇒ Object

Return the computed histogram as an array of Bin objects.



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# File 'lib/more_math/histogram.rb', line 17

def to_a
  @result
end