Convert factor to integer

 

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  • How to convert a factor to integernumeric without loss of information? 5 answers

    • You can combine the two functions; coerce to characters thence to numerics: 

    > fac <- factor(c("1","2","1","2"))
> as.numeric(as.character(fac))
[1] 1 2 1 2

    Quoting directly from the help page for factor :

    To transform a factor f to its original numeric values, as.numeric(levels(f))[f] is recommended and slightly more efficient than as.numeric(as.character(f)) .

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