lib/xirr/bisection.rb in xirr-0.2.9 vs lib/xirr/bisection.rb in xirr-0.3.0

@@ -6,10 +6,11 @@
 
     # Calculates yearly Internal Rate of Return
     # @return [BigDecimal]
     # @param midpoint [Float]
     # An initial guess rate will override the {Cashflow#irr_guess}
-    def xirr(midpoint = nil)
+    def xirr(midpoint = nil, c_method = :normal)
+      @c_method = c_method
 
       # Initial values
       left = [BigDecimal.new(-0.99, Xirr::PRECISION), cf.irr_guess].min
       right = [BigDecimal.new(9.99, Xirr::PRECISION), cf.irr_guess + 1].max
       @original_right = right