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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