From: unbewusst.sein@... (=?ISO-8859-1?Q?Une_B=E9v?= =?ISO-8859-1?Q?ue?=)
Date: 2007-11-22T17:40:04+09:00
Subject: syntax Float equality within epsilon


i need to test float numbers within an epsilon, then i've extended the
Float clas like that :

class Float
  def ===( aFloat, eps = 1.0e-10)
    begin
      clazz = aFloat.class.to_s
      raise "Argument \"#{aFloat}\" must be a Float (being of
#{clazz})." if clazz != "Float"
      ( self > aFloat - eps ) && ( self < aFloat + eps )
    rescue
      puts "An error occurred: #{$!}"
      nil
    end
  end
end


this works as expected except when i want not to use the default value
for eps where i couldn't find the correct syntax :
a = 1.000000001
b = 1.00000000012
p ( a ===( b, 0.001) ).to_s
gave me :
[...] syntax error, unexpected ')', expecting tCOLON2 or '[' or '.'
p ( a ===( b, 0.001) ).to_s
                    ^

why ???

-- 
Une B�vue