From: bernhard stoecker <lists@...>
Date: 2012-09-11T19:31:36+09:00
Subject: hand over block to a submethod

hi @ all,

lets assume I have two methods in class Func

class Func

  def self.mean(array)
    return 0 if(array.size == 0)
    if(block_given?)
      return array.map{|x| yield(x)}.sum.to_f / array.size
    end
    return array.sum.to_f / array.size
  end



  def self.variance(array)
    return 0 if array.size == 0
    avr = Func.mean(array) #HOW TO HAND OVER A BLOCK???

    if(block_given?)
      return array.map { |i| (yield(i) - avr)**2 }.sum / array.size
    end
    return self.map { |i| (i - avr)**2 }.sum / self.size

  end

end


my problem is, that i have to hand over the block given to variance to
the mean method. is this possible and if yes how?

thanks in advance

greets bernhard

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