R dataframe with varied column lengths

Question

I have a dataframe with 10 rows

df <- c(1:10)

How do I add another column to the dataframe which has only 5 rows?

df2 &l         


        

Answer 1

There are two approaches I know of to get what you're asking for BUT this may not be the best approach to the problem as others have pointed out. What I'm going to show you I myself would not use (I'd opt for the list option most likely as Tim shows).

df <- data.frame(var=1:10)  #notice I created a data.frame vs. the vector you called
new.col <- c(1:5)

#METHOD 1
df$new.col <- c(new.col, rep(NA, nrow(df)-length(new.col)))  #keep as integer
#METHOD 2
df$new.col2 <- c(new.col, rep("", nrow(df)-length(new.col))) #converts to character
df                                         #look at it
str(df)                                    #see what's happening to the columns