Class: Statsample::Combination

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

Overview

Combination class systematically generates all combinations of n elements, taken r at a time. With rbgsl, GSL::Combination is available for extra speed

Use:

comb=Statsample::Combination.new(3,5)
=> #<Statsample::Combination:0x7f6323804e08 @n=5, @d=#<Statsample::Combination::CombinationGsl:0x7f63237ff7f0 @n=5, @k=3, @c=GSL::Combination>, @k=3>
comb.each{|c| p c }
[0, 1, 2]
[0, 1, 3]
[0, 1, 4]
[0, 2, 3]
[0, 2, 4]
[0, 3, 4]
[1, 2, 3]
[1, 2, 4]
[1, 3, 4]
[2, 3, 4]

Reference:

Defined Under Namespace

Classes: CombinationGsl, CombinationRuby

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(k, n, only_ruby = false) ⇒ Combination

Returns a new instance of Combination.



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# File 'lib/statsample/combination.rb', line 23

def initialize(k,n,only_ruby=false)
  @k=k
  @n=n
  if Statsample.has_gsl? and !only_ruby
    @d=CombinationGsl.new(@k,@n)
  else
    @d=CombinationRuby.new(@k,@n)
  end
end

Instance Attribute Details

#d ⇒ Object (readonly)

Returns the value of attribute d.



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# File 'lib/statsample/combination.rb', line 22

def d
  @d
end

Instance Method Details

#each ⇒ Object 



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# File 'lib/statsample/combination.rb', line 32

def each
  reset
  while a=next_value
    yield a
  end
end

#next_value ⇒ Object 



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# File 'lib/statsample/combination.rb', line 41

def next_value
    @d.next_value
end

#reset ⇒ Object 



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# File 'lib/statsample/combination.rb', line 38

def reset
    @d.reset
end