相关疑难解决方法(0)

我有几个数据框,我想按行组合.在生成的单个数据框中,我想创建一个新变量,用于标识观察来自哪个数据集.

# original data frames
df1 <- data.frame(x = c(1, 3), y = c(2, 4))
df2 <- data.frame(x = c(5, 7), y = c(6, 8))

# desired, combined data frame
df3  <- data.frame(x = c(1, 3, 5, 7), y = c(2, 4, 6, 8),
                   source = c("df1", "df1", "df2", "df2")
# x y source
# 1 2    df1
# 3 4    df1
# 5 6    df2
# 7 8    df2

我怎样才能做到这一点？提前致谢!

我很难将一个元素列入其中.我的变量如下所示:

> file
[[1]]
                 loc  recorded_at fields.b64_value fields.b64_value fields.b64_value
1  9.03913, 45.61335 1.476451e+12         AAAC1g==             <NA>             <NA>
2  9.03924, 45.61362 1.476451e+12         AAAM+Q==             <NA>             <NA>
3  9.03995, 45.61365 1.476451e+12         AAAL2A==             <NA>             <NA>
4  9.04005, 45.61340 1.476451e+12             <NA>             <NA>             <NA>
5  9.04017, 45.61406 1.476451e+12         AAAUGg==             <NA>             <NA>
6  9.03949, 45.61419 1.476451e+12         AABLBw==             <NA>             <NA>
7  9.03496, 45.61319 1.476451e+12             <NA>         AAAABA==             <NA>
8  9.03440, 45.61295 1.476451e+12         AAArMQ==             <NA>             <NA>
9  9.03448, 45.61285 1.476451e+12             <NA>             <NA>             <NA>
10 9.03495, 45.61241 1.476451e+12         AAAAAA==             <NA>             AA==

[[2]] …