将两个独立向量的所有组合粘贴到 R 中

Question

我有两个向量

df1 <- c("a","b","c")
df2 <- c("1","2","3")

 # expected output
 #  a1 a2 a3 b1 b2 b3 c1 c2 c3

我看过，但是，这并不能解决我的困境。

Answer 1

像这样：

paste0(rep(df1, length(df1)), rep(df2, length(df2)))

或者这样：

df_comb <- expand.grid(df1, df2)
paste0(df_comb$Var1, df_comb$Var2)

Answer 2

另一种方法：

df1 <- c("a","b","c")
df2 <- c("1","2","3")

apply(expand.grid(df1, df2), 1, paste, collapse="")

Answer 3

您可以merge：apply(merge(df1, df2), 1, function(row) paste(row[1], row[2], sep = ''))

Paste all combinations of two separate vectors in R