lib/dydx/algebra/formula.rb in dydx-0.1.25 vs lib/dydx/algebra/formula.rb in dydx-0.1.28

@@ -3,9 +3,10 @@
     class Formula
       include Helper
       attr_accessor :f, :operator, :g
 
       def initialize(f, g, operator)
+        g, f = f, g if g.is_num? && operator.commutative?
         @f, @g, @operator = f, g, operator
       end
 
       def differentiate(sym=:x)
         case @operator