
Dear list,
I'm trying to concatenate the values of two columns but im not able to do it:

i have a dataframe with the following two columns:

X               VAR1       VAR2
1                                   2
2                   1                
3                   2
4                                   3
5                                   4  
6                  4


what i would like to obtain is:
X               VAR3      
1                   2               
2                   1                
3                   2
4                   3            
5                  4               
6                  4

I try with paste but what I obtain is:
X                 VAR3

1                   NA2
2                    1NA

3                    2NA

4                    NA3

5                    NA4

6                    4NA

 Thanks a lot!!

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