I am using Factors to handle character strings in FF.
tt <- ff(factor(c("a","b","c")),names=c("c1","c2","c3")) tt ff (open) integer length=3 (3) levels: a b c c1 c2 c3 a b c
When I try to change one of the data items I get the following:
tt["c2"] <- "d" Warning message: In ram2ffcode(value, fflev, vmode) : unknown factor values mapped to NA
Any ideas how to change the data to get:
ff (open) integer length=3 (3) levels: a c d c1 c2 c3 a d c
