method

atan2

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atan2(y,x) private

returns the arc tangent of y divided by x using the signs of y and x to determine the quadrant

# File lib/cmath.rb, line 286
  def atan2(y,x)
    begin
      if y.real? and x.real?
        atan2!(y,x)
      else
        (-1.0).i * log((x + 1.0.i * y) / sqrt(x * x + y * y))
      end
    rescue NoMethodError
      handle_no_method_error
    end
  end

atan2

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