xts上的xts.coercible错误而apply.daily

Question

我有一个日内系列( xts)，我想聚合成每日频率：apply.daily(mean(asd))。它给了我：

Try.xts中的错误(x，Error =“必须是xts-矫顽力或timeBased")：必须是xts-矫顽力或timeBased

有人知道这个错误可能来自哪里吗？

> head(asd)
                    EUR.USD.Close
2015-01-02 01:00:00       1.20875
2015-01-02 01:01:00       1.20870
2015-01-02 01:02:00       1.20880
2015-01-02 01:03:00       1.20890
2015-01-02 01:04:00       1.20885
2015-01-02 01:05:00       1.20885

> str(asd)
An ‘xts’ object on 2015-01-02 01:00:00/2015-01-30 22:59:00 containing:
  Data: num [1:28140, 1] 1.21 1.21 1.21 1.21 1.21 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr "EUR.USD.Close"
  Indexed by objects of class: [POSIXct,POSIXt] TZ: 
  xts Attributes:  
List of 4
 $ from   : chr "20150421  09:00:00"
 $ to     : chr "20150501  09:00:00"
 $ src    : chr "IB"
 $ updated: POSIXct[1:1], format: "2015-06-07 01:46:37"

Answer 1

语法应该是

  apply.daily(asd, mean)
 #                   EUR.USD.Close
 #2015-01-02 01:05:00      1.208808

有关更多信息，请查看?apply.daily和该页面中的示例。

我可以用错误的代码语法再现错误。

 apply.daily(mean(asd))
 #Error in try.xts(x, error = "must be either xts-coercible or timeBased") : 
 # must be either xts-coercible or timeBased