Class: StatVal::StatVal

Inherits:
Object
  • Object
show all
Defined in:
lib/statval/statval.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ StatVal

Returns a new instance of StatVal.



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# File 'lib/statval/statval.rb', line 11

def initialize(options = {}) ; reset(options) end

Instance Attribute Details

#max ⇒ Object

Returns the value of attribute max.



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# File 'lib/statval/statval.rb', line 7

def max
  @max
end

#min ⇒ Object

Returns the value of attribute min.



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# File 'lib/statval/statval.rb', line 6

def min
  @min
end

#num ⇒ Object

Returns the value of attribute num.



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# File 'lib/statval/statval.rb', line 5

def num
  @num
end

#sq_sum ⇒ Object

Returns the value of attribute sq_sum.



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# File 'lib/statval/statval.rb', line 9

def sq_sum
  @sq_sum
end

#sum ⇒ Object

Returns the value of attribute sum.



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# File 'lib/statval/statval.rb', line 8

def sum
  @sum
end

Instance Method Details

#+(value) ⇒ Object 



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# File 'lib/statval/statval.rb', line 66

def +(value) ; self.class.new << self << value end

#<<(value, *rest) ⇒ Object 



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# File 'lib/statval/statval.rb', line 68

def <<(value, *rest)
  this = self
  if value.kind_of? StatVal
    if empty?
      reset(value.to_hash(:writable))
    else
      begin
        @num    += value.num
        @sum    += value.sum
        @sq_sum += value.sq_sum
        val_min  = value.min
        val_max  = value.max
        @min     = val_min if val_min < @min
        @max     = val_max if val_max > @max
      end unless value.empty?
    end
  else
    if value.kind_of? Numeric
      @sum       += value
      @sq_sum    += value * value
      @num       += 1
      @min        = value if value < @min
      @max        = value if value > @max
    else
      if value.respond_to?(:each_pair)
        value.each_pair { |k, v| this << v }
      else
        if value.respond_to?(:each)
          value.each { |v| this << v }
        else
          raise ArgumentError
        end
      end
    end
  end
  rest.each { |v| this << v } if rest
  this
end

#[](key) ⇒ Object 



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# File 'lib/statval/statval.rb', line 25

def [](key)
  case key
    when :num then num
    when :min then min
    when :max then max
    when :sum then sum
    when :sq_sum then sq_sum
    when :std_ratio then std_ratio
    when :avg then avg
    when :std then std
    when :avg_sq then avg_sq
    when :var then var
    else
      raise ArgumentError
  end
end

#[]=(key, new_val) ⇒ Object 



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# File 'lib/statval/statval.rb', line 42

def []=(key, new_val)
  case key
    when :num then self.num = new_val
    when :min then self.min = new_val
    when :max then self.max = new_val
    when :sum then self.sum = new_val
    when :sq_sum then self.sq_sum = new_val
    else
      raise ArgumentError
  end
end

#avg ⇒ Object 



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# File 'lib/statval/statval.rb', line 127

def avg ; if empty? then zero_if_unbounded(abs_div(@max - @min, 2)) else abs_div(@sum, @num) end end

#avg_sq ⇒ Object 



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# File 'lib/statval/statval.rb', line 129

def avg_sq
  if empty? then zero_if_unbounded(abs_div((@max*@max) - (@min*@min), 2)) else abs_div(@sq_sum, @num) end
end

#bounded? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/statval/statval.rb', line 125

def bounded? ; ! (abs_is_infinite(@min) || abs_is_infinite(@max)) end

#each_pair ⇒ Object Also known as: each 



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# File 'lib/statval/statval.rb', line 54

def each_pair
  this = self
  keys.each { | key| yield key, this[key] }
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/statval/statval.rb', line 123

def empty? ; @num == 0 end

#keys ⇒ Object 



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# File 'lib/statval/statval.rb', line 23

def keys ; ::StatVal.keys(:default) end

#reset(options = {}) ⇒ Object 



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# File 'lib/statval/statval.rb', line 13

def reset(options = {})
  options[:num] = 0 unless options[:num]
  options[:min] = nil unless options[:min]
  options[:max] = nil unless options[:max]
  options[:sum] = 0 unless options[:sum]
  options[:sq_sum] = 0 unless options[:sq_sum]
  options.each_pair { |k, v| self[k] = v}
  options
end

#std ⇒ Object 



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# File 'lib/statval/statval.rb', line 135

def std ; Math.sqrt(var) end

#std_ratio ⇒ Object 



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# File 'lib/statval/statval.rb', line 160

def std_ratio ; std / avg end

#time ⇒ Object 



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# File 'lib/statval/statval.rb', line 107

def time
  start = Time.now
  begin
    yield
  ensure
    stop = Time.now
    self << (stop-start)
  end
end

#to_hash(which_keys = nil, convert_to_s = false) ⇒ Object 



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# File 'lib/statval/statval.rb', line 117

def to_hash(which_keys = nil, convert_to_s = false)
  ::StatVal.key_hash(which_keys).inject({}) { |h, (attr, name)| h[(if convert_to_s then name.to_s else name end)] = self[attr]; h }
end

#to_s ⇒ Object 



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# File 'lib/statval/statval.rb', line 121

def to_s ; to_hash.to_s end

#values ⇒ Object 



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# File 'lib/statval/statval.rb', line 61

def values
  this = self
  keys.map { |key| this[key] }
end

#var ⇒ Object 



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# File 'lib/statval/statval.rb', line 133

def var ; avg_sq - (avg * avg) end