Class: Planout::OpRandom

Inherits:
OpSimple show all
Defined in:
lib/planout/op_random.rb

Constant Summary collapse

LongScale = 
Float(0xFFFFFFFFFFFFFFF)

Instance Attribute Summary

Attributes inherited from Operator

#args

Instance Method Summary collapse

Methods inherited from OpSimple

#execute, #simple_execute

Methods inherited from Operator

#execute, #initialize

Constructor Details

This class inherits a constructor from Planout::Operator

Instance Method Details

#get_hash(appended_unit = nil) ⇒ Object 



14
15
16
17
18
19
20
21
 
# File 'lib/planout/op_random.rb', line 14

def get_hash(appended_unit = nil)
  salt = @parameters[:salt]
  salty = "#{@mapper.experiment_salt}.#{salt}"
  unit_str = get_unit(appended_unit).join('.')
  x = "#{salty}.#{unit_str}"
  last_hex = (Digest::SHA1.hexdigest(x))[0..14]
  last_hex.to_i(16)
end

#get_uniform(min_val = 0.0, max_val = 1.0, appended_unit = nil) ⇒ Object 



23
24
25
26
 
# File 'lib/planout/op_random.rb', line 23

def get_uniform(min_val = 0.0, max_val = 1.0, appended_unit = nil)
  zero_to_one = self.get_hash(appended_unit)/LongScale
  min_val + (max_val-min_val) * zero_to_one
end

#get_unit(appended_unit = nil) ⇒ Object 



7
8
9
10
11
12
 
# File 'lib/planout/op_random.rb', line 7

def get_unit(appended_unit = nil)
  unit = @parameters[:unit]
  unit = [unit] if !unit.is_a? Array
  unit += appended_unit if appended_unit != nil
  unit
end