Hi R,

 

Let 'dd' be a data frame given as:

 

dd=data.frame(aa=c("a","a","b","a","b","b"),bb=c(1,1,1,2,3,4))

 

Now I want to create a column 'g' such that if dd$aa=a then dd$g=1 else
dd$g= -1 .

 

So, I gave the below syntax:

 

if((dd$aa)=="a") dd$g=1 else dd$g= -1

 

But I get the error message as:

Warning message: 

the condition has length > 1 and only the first element will be used in:
if ((dd$aa) == "a") dd$g = 1 else dd$g = -1 

 

and dd=

 

> dd

  aa bb g

1  a  1 1

2  a  1 1

3  b  1 1

4  a  2 1

5  b  3 1

6  b  4 1

> 

 

Please let me know what is the error I am doing?

 

 

 

 


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