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strange question...
2 messages · Ana Patricia Martins, Seth Falcon
On 1 Feb 2006, ana.pmartins at ine.pt wrote:
am$e_isell <- factor( with( am, ifelse( e_iacc == 1 & C5 == 1, 1, 0))) cbind( am$e_isell[4256], am$C6[4256]) [,1] [,2] [1,] "2" "1" (????????????? :( ) Does anyone understand why this happens?
A factor is an integer vector with levels. Although there are many operations one can perform on a factor that will "work" because of automagic convertion of the factor to its underlying integer vector, it is rarely useful, IMHO. The following may help you see what is going on: f = factor(c(0, 1, 1, 0)) unclass(f) as.numeric(f) as.integer(f) as.character(f) as.integer(as.character(f)) + seth