粘貼兩種單獨載體的所有組合中的R

Question

我有兩個向量

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

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

我見過Paste all combinations of a vector in R，但是，這並沒有解決我的困境。

Answer 1

另一種方法：

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

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

Answer 2

像這樣：

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

或者這樣：

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

Answer 3

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