我很抱歉提出一个非常简单的问题.我有一个数据框,我尝试将dput放在下面.
mydf <- structure(list(br.Id = c(1992.0001, 1992.0002, 1992.0003, 1992.0004,
1992.0005, 1992.0006, 1992.0007, 1992.0008, 1992.0009, 1992.001
), si.month = c(4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L, 4L), br.day = c(23L,
23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L, 23L), br.year = c(1992L,
1992L, 1992L, 1992L, 1992L, 1992L, 1992L, 1992L, 1992L, 1992L
), branch = 1:10, br.location = c(160170L, 160170L, 160170L, 160170L,
160170L, 160170L, 160170L, 160170L, 160170L, 160170L), si.length = c(90L,
128L, 112L, 68L, 56L, 58L, 111L, 111L, 115L, 65L), …