在splus中一函数定义如下：

reorderTS = function(x)
                   {
                        x.pos = positions(x)
                        x.data = seriesData(x)
 
                        pos.order = order(x.pos)
                        x.pos = x.pos[pos.order]
                        x.data = sub(x.data, pos.order,)
 
                       if (!is.null(rowIds(x.data)))
                          {
                                x.len = nrow(x.data)
                                rowIds(x.data) = as.character(1:x.len)
                           }
  
                      ans = timeSeries(x.data, pos=x.pos)
                      ans
                   }

在引入finmetrics模块的情况下，运行下面command（其中msftq,ts为“timeSeries” object）

 msftq1.ts = reorderTS(msftq.ts)

出现错误如下：

Problem in sub(x.data, pos.order,  ): argument "x" is missing with no default
Use traceback() to see the call stack

请高手指教，谢谢！