Dear Rhelpers, Is there a faster way than below to set a vector based on values from another vector? I'd like to call a pre-existing function for this, but one which can also handle an arbitrarily large number of categories. Any ideas?
Cat=c('a','a','a','b','b','b','a','a','b') # Categorical variable C1=vector(length=length(Cat)) # New vector for numeric values # Cycle through each column and set C1 to corresponding value of Cat. for(i in 1:length(C1)){ if(Cat[i]=='a') C1[i]=-1 else C1[i]=1 } C1 [1] -1 -1 -1 1 1 1 -1 -1 1 Cat [1] "a" "a" "a" "b" "b" "b" "a" "a" "b" Sincerely, KeithC. Psych Undergrad, CU Boulder (US) RE McNair Scholar ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.