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003190
2007 Feb 19
5
categorical column to numeric column
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: