我有以下数据：
feb2007 <-
structure(list(V2 = structure(list(sec = c(0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0), min = 0:19, hour = c(0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L), mday = c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L), mon = c(1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,
1L), year = c(107L, 107L, 107L, 107L, 107L, 107L, 107L, 107L,
107L, 107L, 107L, 107L, 107L, 107L, 107L, 107L, 107L, 107L, 107L,
107L), wday = c(4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L,
4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L), yday = c(31L, 31L, 31L, 31L,
31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L, 31L,
31L, 31L, 31L), isdst = c(0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L,
0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L, 0L), zone = c("EST",
"EST", "EST", "EST", "EST", "EST", "EST", "EST", "EST", "EST",
"EST", "EST", "EST", "EST", "EST", "EST", "EST", "EST", "EST",
"EST"), gmtoff = c(NA_integer_, NA_integer_, NA_integer_, NA_integer_,
NA_integer_, NA_integer_, NA_integer_, NA_integer_, NA_integer_,
NA_integer_, NA_integer_, NA_integer_, NA_integer_, NA_integer_,
NA_integer_, NA_integer_, NA_integer_, NA_integer_, NA_integer_,
NA_integer_)), .Names = c("sec", "min", "hour", "mday", "mon",
"year", "wday", "yday", "isdst", "zone", "gmtoff"), class = c("POSIXlt",
"POSIXt")), V10 = c("45", "45", "45", "45", "45", "45", "44",
"45", "45", "45", "45", "45", "45", "45", "45", "45", "45", "46",
"46", "46"), V12 = c("43", "43", "43", "43", "43", "42", "42",
"42", "43", "43", "43", "43", "43", "43", "43", "43", "43", "43",
"43", "43")), .Names = c("V2", "V10", "V12"), row.names = c(NA,
20L), class = "data.frame")
feb2007$V12 <- as.numeric(feb2007$V12)
feb2007$V10 <- as.numeric(feb2007$V10)
x <- xts(feb2007$V2,feb2007$V10)
但是当我尝试绘制时间序列时，我得到了：
plot.xts(x)
# Error in as.POSIXlt.POSIXct(.POSIXct(.index(x)), tz = indexTZ(x)) :
# invalid 'tz' value
我该如何解决这个问题？我不知怎的相信POSIXlt类不正确，但是如果我把它改成as.Date那么我就会失去对这个问题至关重要的小时和分钟。