在R中的两个data.frames之间更改值

我有以下数据。帧（示例）：

我希望df2变得如下所示：

>df2
      id            VALUE
1      1         theOther
2      2          another
3      3             that
4      4             this
4      5          another
4      6             that
4      7         theOther
.      .                .
.      .                .

可以通过对每个值使用以下命令“手动”完成：

df2[df2==1] <- 'this'
df2[df2==2] <- 'that'
       .
       .

df2[df2==1]试试看

数据
df1您可以：

library(qdapTools)
df2$VALUE <- lookup(terms = df2$VALUE, key.match = df1)

谢谢我更喜欢
匹配
答案，因为它更具可读性：D
df2$VALUE <- setNames(df1$ACTION, df1$number)[as.character(df2$VALUE)]
df2
#   id    VALUE
#1  1 theOther
#2  2  another
#3  3     that
#4  4     this
#5  5  another
#6  6     that
#7  7 theOther

df2$VALUE <- df1$ACTION[match(df2$VALUE, df1$number)]

df1 <- structure(list(number = 1:4, ACTION = c("this", "that", 
"theOther", 
"another")), .Names = c("number", "ACTION"), class = "data.frame", 
row.names = c("1", "2", "3", "4"))

df2 <- structure(list(id = 1:7, VALUE = c(3L, 4L, 2L, 1L, 4L, 2L, 3L
 )), .Names = c("id", "VALUE"), class = "data.frame", row.names = c("1", 
 "2", "3", "4", "5", "6", "7"))

library(qdapTools)
df2$VALUE <- lookup(terms = df2$VALUE, key.match = df1)

#  id    VALUE
#1  1 theOther
#2  2  another
#3  3     that
#4  4     this
#5  5  another
#6  6     that
#7  7 theOther