我在动物园遇到了重复索引警告/错误。我花了一些时间进行故障排除,结果归结为以下数据/片段:
Lines = "Index,dbt,rh,dpt,wind.mph,gust.mph,wind.dir,voltage,klux,fc
2008-03-09 01:00:00,37.96,77.25,31.60,4.16,5.39,247,0.00,28.283,2643.28
2008-03-09 02:00:00,37.20,77.25,30.90,0.00,0.43,244,0.00,28.283,2643.28"
x <- read.table(header=T,text=Lines,sep=",")
library(zoo)
z = zoo(x[,2:10],as.POSIXct(x$Index))
如果我运行上述内容,则会收到以下警告:
Warning message:
In zoo(x[, 2:10], as.POSIXct(x$Index)) :
some methods for “zoo” objects do not work if the index entries in ‘order.by’ are not unique
我想知道数据/索引有什么问题。它们实际上是不同的。
但是,以下命令:
library(xts)
make.index.unique(index(z))
给出了一个令人费解的结果:
[1] "2008-03-09 01:00:00 MST" "2008-03-09 01:00:00 MST"
上面的命令是否只是使索引重复?有人可以告诉我这是如何工作的吗?