Class: Rational

Inherits:
Numeric
  • Object
show all
Defined in:
lib/fathom/archive/noodle.rb

Overview

Since Rational is the automatic choice for probabilistic data,

and since I don't want to override how mathn infers numbers, 
I am adding some baggage to Rational:

* It still reduces to the LCD
* It keeps track of all events, 
  so that I can keep a new event proportional to old ones
* It has an add_event (add) which takes a true or false value
  true values, records that a condition was found

This really only works for binary data, but this is a noodle file.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.orig_reduce ⇒ Object 



78
 
# File 'lib/fathom/archive/noodle.rb', line 78

alias :orig_reduce :reduce

.reduce(num, den = 1) ⇒ Object 



79
80
81
82
83
84
 
# File 'lib/fathom/archive/noodle.rb', line 79

def reduce(num, den=1)
  val = orig_reduce(num, den)
  val.total_events = den
  val.positive_events = num
  val
end

Instance Method Details

#add_event(positive = true) ⇒ Object Also known as: add

Uses the Rational constructor to calculate the lowest common denominator



111
112
113
114
115
116
117
 
# File 'lib/fathom/archive/noodle.rb', line 111

def add_event(positive=true)
  num = positive ? self.positive_events + 1 : self.positive_events
  den = self.total_events + 1
  other = Rational(num, den)
  @numerator, @denominator, @positive_events, @total_events = other.numerator, other.denominator, num, den
  self
end

#positive_events(val = nil) ⇒ Object Also known as: positive 



99
100
101
102
103
 
# File 'lib/fathom/archive/noodle.rb', line 99

def positive_events(val=nil)
  @positive_events ||= 0
  @positive_events = val if val
  @positive_events
end

#positive_events=(val) ⇒ Object 



106
107
108
 
# File 'lib/fathom/archive/noodle.rb', line 106

def positive_events=(val)
  positive_events(val)
end

#total_events(val = nil) ⇒ Object Also known as: events, total 



87
88
89
90
91
 
# File 'lib/fathom/archive/noodle.rb', line 87

def total_events(val=nil)
  @total_events ||= 0
  @total_events = val if val
  @total_events
end

#total_events=(val) ⇒ Object 



95
96
97
 
# File 'lib/fathom/archive/noodle.rb', line 95

def total_events=(val)
  total_events(val)
end