Find the associated values of a vector in a dataframe

I have a reference dataframe df which determines the relationship between a number code and the name associated to it.

df <- data.frame(Number = 1:5,
                 Name = c("Aaa", "Bbb", "Ccc", "Ddd", "Eee"))

Now, I have a vector of numbers number <- c(1,1,3,5,6) and I want to get their corresponding Name, taking into account that:

• There are repeated numbers
• Some of the numbers may not have an associated name in the table

So, the result I expect is:

df2 <- data.frame(number,
                  Name = c("Aaa", "Aaa", "Ccc", "Eee", NA))

The vector of numbers I have is very long, any idea about how to do it?

>Solution :

> df$Name[match(number,df$Number)]
[1] "Aaa" "Aaa" "Ccc" "Eee" NA