我有这张桌子
Column A | Column B | Column C | Column D |
---|---|---|---|
A | x | 1 | k1 |
B | k | 2 | k2 |
C | z | 3 | k3 |
D | y | 4 | k4 |
我想打印一个包含a列中所有字符串的txt文件,用逗号分隔.
df1 <- structure(list(ColumnA = c("A", "B", "C", "D"), ColumnB = c("x",
"k", "z", "y"), ColumnC = 1:4, ColumnD = c("k1", "k2", "k3",
"k4")), class = "data.frame", row.names = c(NA, -4L))