我的data.table
v1.9.2 有一个奇怪的结果:
DT timestamp 1: 2013-01-01 17:51:00.707 2: 2013-01-01 17:51:59.996 3: 2013-01-01 17:52:00.059 4: 2013-01-01 17:54:23.901 5: 2013-01-01 17:54:23.914 str(DT) Classes ‘data.table’ and 'data.frame': 5 obs. of 1 variable: $ timestamp: POSIXct, format: "2013-01-01 17:51:00.707" "2013-01-01 17:51:59.996" "2013-01-01 17:52:00.059" "2013-01-01 17:54:23.901" ... - attr(*, "sorted")= chr "timestamp" - attr(*, ".internal.selfref")=
当我应用该duplicated()
函数时,我得到以下结果:
duplicated(DT) [1] FALSE FALSE FALSE FALSE TRUE
让第5行等于第4行是很奇怪的.这也阻止我加入R中的表.是否与POSIXct类型有关?
在skydrive上的DT:DT
谢谢.