Class: Dumbstats::Histogram

Inherits:
Object
  • Object
show all
Includes:
Initialization
Defined in:
lib/dumbstats/histogram.rb

Overview

Renders a Histogram of values.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Initialization

#update_from_hash!

Constructor Details

#initialize(*args) ⇒ Histogram

Returns a new instance of Histogram.



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# File 'lib/dumbstats/histogram.rb', line 16

def initialize *args
  @min = @max = nil
  @show_sum = true
  super
  @width ||= 15
  @height ||= 20
end

Instance Attribute Details

#height ⇒ Object

Returns the value of attribute height.



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

def height
  @height
end

#max ⇒ Object

Returns the value of attribute max.



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# File 'lib/dumbstats/histogram.rb', line 13

def max
  @max
end

#min ⇒ Object

Returns the value of attribute min.



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# File 'lib/dumbstats/histogram.rb', line 13

def min
  @min
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/dumbstats/histogram.rb', line 12

def name
  @name
end

#show_sum ⇒ Object

Returns the value of attribute show_sum.



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

def show_sum
  @show_sum
end

#values ⇒ Object

Returns the value of attribute values.



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# File 'lib/dumbstats/histogram.rb', line 12

def values
  @values
end

#width ⇒ Object

Returns the value of attribute width.



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

def width
  @width
end

Instance Method Details

#generate ⇒ Object

Raises:

  • (TypeError) 


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# File 'lib/dumbstats/histogram.rb', line 24

def generate
  raise TypeError, "@values not set" unless @values
  return [ ] if @values.size < 2
  @x_graph = Graph.new(:min => @min, :max => @max, :values => @values, :width => @width)
  return [ ] if @x_graph.empty?
  # @x_graph.fix_width!

  @buckets = Hash.new { |h, k| b = Bucket.new; b.name = k; h[k] = b }
  @values.each do | v |
    next if @min and v < @min
    next if @max and v > @max
    i = @x_graph.v_to_x(v).to_i
    if i >= 0 and i < @x_graph.width
      @buckets[i].add! v
    end
  end

  cnt = @buckets.values.map { |b| b.count }
  cnt << 0
  @cnt_graph = Graph.new(:values => cnt, :width => @height)
  return [ ] if @cnt_graph.empty?
  # @cnt_graph.fix_width!

  if @show_sum
  sum = @buckets.values.map { |b| b.sum }
  sum << 0
  @sum_graph = Graph.new(:values => sum, :width => @height)
  # @sum_graph.fix_width!
  end

  # binding.pry

  rows = [ ]
  table =
    Terminal::Table.new() do | t |
    t.title = @name
    s = t.style
    s.border_x =
      s.border_y =
      s.border_i = ''
    s.padding_left = 0
    s.padding_right = 1

    # Header:
    h = [ '>=', '<', 'cnt', '%', "cnt h", "min", "avg", "max" ]
    align_right = [ 0, 1, 2, 3, 5, 6, 7 ]
    if @show_sum
      h.push('sum', '%', 'sum h')
      align_right.push(8, 9)
    end
    rows << h

    cnt_sum = sum_sum = 0
    @width.times do | i |
      x0 = @x_graph.x_to_v(i)
      x1 = @x_graph.x_to_v(i + 1)
      $stderr.puts "  i=#{i} x0=#{x0.inspect} x1=#{x1.inspect} #{@x_graph.min.inspect} #{@x_graph.max.inspect}" if @debug
      x0 = x0.to_i
      x1 = x1.to_i

      b = @buckets[i]
      b.finish!

      cnt_sum += b.count
      r = [ ]
      r << x0
      r << x1
      r << b.count
      r << @cnt_graph.percent(b.count)
      r << @cnt_graph.bar(b.count)
      r << b.min
      r << (b.avg && (@cnt_graph.values_are_integers ? b.avg.to_i : b.avg))
      r << b.max
      if @show_sum
        sum_sum += b.sum || 0
        r << b.sum
        r << @sum_graph.percent(b.sum || 0)
        r << @sum_graph.bar(b.sum || 0)
      end
      rows << r
    end

    f = [ '', '=', cnt_sum, '', '', '', '', '' ]
    if @show_sum
      f.push(sum_sum, '', '')
    end
    rows << f

    rows.each do | r |
      r.map! do | c |
        case c
        when nil
          ''
        when Integer
          thousands(c)
        else
          c
        end
      end
      t << r
    end

    raise unless h.size == f.size

    align_right.each { | c | t.align_column(c, :right) }
  end

  formatted = table.to_s.split("\n")

  formatted
end

#thousands(x, sep = '_') ⇒ Object 



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# File 'lib/dumbstats/histogram.rb', line 136

def thousands x, sep = '_'
  x && x.to_s.reverse!.gsub(/(\d{3})/, "\\1#{sep}").reverse!.sub(/^(\D|\A)#{sep}/, '')
end