Class: Array

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

Instance Method Summary collapse

Instance Method Details

#avg ⇒ Object 



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# File 'lib/jkr/array.rb', line 7

def avg()
  if self.empty?
    nil
  else
    self.sum.to_f / self.size
  end
end

#every?(&block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/jkr/array.rb', line 28

def every?(&block)
  ret = true
  self.each do |elem|
    unless block.call(elem)
      ret = false
      break
    end
  end
  ret
end

#group_by ⇒ Object 



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# File 'lib/jkr/array.rb', line 39

def group_by()
  ret = Hash.new{ Array.new }
  self.each do |elem|
    ret[yield(elem)] += [elem]
  end

  ret
end

#stdev ⇒ Object 



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# File 'lib/jkr/array.rb', line 15

def stdev()
  avg = self.avg
  var = self.map{|val| (val - avg) ** 2}.sum
  if self.size > 1
    var /= self.size - 1
  end
  Math.sqrt(var)
end

#sterr ⇒ Object 



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# File 'lib/jkr/array.rb', line 24

def sterr()
  self.stdev / Math.sqrt(self.size)
end

#sum ⇒ Object 



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# File 'lib/jkr/array.rb', line 3

def sum()
  self.inject(&:+)
end