def append_xy( x=[], y=[],name=nil, options={})
         name = translate_name(name)
         if !self.new_data_check(name)
            @x[name] << x
            @y[name] << y
            self.append_series_name(name, options)
            self.options_callback(options)
            self.append_callback(x,y,name,options)
         else
            self.new_data(x,y,name,options)
         end
      end
def append_xy( x=[], y=[],name=nil, options={})
         name = translate_name(name)
         if !self.new_data_check(name)
            @x[name] << x
            @y[name] << y
            self.append_series_name(name, options)
            self.options_callback(options)
            self.append_callback(x,y,name,options)
         else
            self.new_data(x,y,name,options)
         end
      end
Interface Functions ===================================