[R] Combining columns of different length

[Vito Ricci]

Hi,

you can use this simple function:

add.col<-function(df, new.col) {n.row<-dim(df)[1]
           length(new.col)<-n.row
           cbind(df, new.col)
 

                        }

see this example:

> x<-cbind(c(1,2,3),c(4,5,6))
> x
     [,1] [,2]
[1,]    1    4
[2,]    2    5
[3,]    3    6
> y<-c(7,8)
> y
[1] 7 8
> add.col<-function(df, new.col) {n.row<-dim(df)[1]
+           length(new.col)<-n.row
+           cbind(df, new.col)
+ 
+                        }
> 
> new.df<-add.col(x,y)
> new.df
         new.col
[1,] 1 4       7
[2,] 2 5       8
[3,] 3 6      NA

I hope I help a little.
Best
Vito

you wrote:

Hi all,

Simple and direct question....
Is it possible to add a shorter column to a data frame
or matrix in such 
a way that the missing values are replaced with NAs?
For example suppose I have

3   2
4   2
5   8

and I want to add a column

3
3

to get...

3   2   3
4   2   3
5   8   NA

Thanks

Federico



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