问题描述
我正在使用 xts 包中的 timeBasedSeq 函数作为时间序列/动物园对象中的索引,但它重复了它创建的某些日子!这会导致动物园出现问题,因为‘order.by’中的索引条目不是唯一的".
I am using The timeBasedSeq function from xts package to use as index in a time series/zoo object but it repeats some of the days it creates! Which than causes problems with zoo because the "index entries in ‘order.by’ are not unique".
例如:
timeBasedSeq("19860601/19861231")
timeBasedSeq("19860601/19861231")
将创建
..."1986-10-23" "1986-10-24" "1986-10-25" "1986-10-26" "1986-10-26" "1986-10-27" "1986-10-28" "1986-10-29""...
..."1986-10-23" "1986-10-24" "1986-10-25" "1986-10-26" "1986-10-26" "1986-10-27" "1986-10-28" "1986-10-29""...
所以出于某种原因,它重复了 26 日,我该如何避免这种情况?
So for some reason it repeats the 26th, how can I avoid that?
推荐答案
该错误在 xts 中.该函数使用 seq.POSIXct
,并且可以通过以下方式产生相同的行为:
The bug is in xts. That function uses seq.POSIXct
, and the same behavior can be produced by:
seq(as.POSIXct("1986-10-01"), as.POSIXct("1986-11-01"), by="day")
更令我惊讶的是 seq.POSIXlt
seq(as.POSIXlt("1986-10-01"), as.POSIXlt("1986-11-01"), by="day")
但是这种行为在 seq.POSIXt 中有详细记录,并且有使用 by="DSTday"
的规定,xts 作者可能应该在天是隐式间隔的情况下使用它.临时解决方法是:
But that behavior is well documented in seq.POSIXt and there is a provision for using by="DSTday"
which the xts authors should probably have used for the situation when days are the implicit interval. The temporary workaround is:
timeBasedSeq("19860601/19861231")[ !duplicated(timeBasedSeq("19860601/19861231") ]
或更紧凑:
unique(timeBasedSeq("19860601/19861231"))
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