mood <- factor(c("blue", "sunny"))
skycolor <- factor(c("azure","blue","teal")
If factors are not defined with levels specifications, automatic merging should
never be allowed. The fact that read.table automatically generates factors
using default levels is why I nearly always import using as.is=TRUE, perform QC
and combining of sources using strings, and only then convert to factor.
If you HAVE defined your factors using explicit levels definitions, you should
have no trouble combining them.
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Sam Steingold <s...@gnu.org> wrote:
>> * Bert Gunter <thagre.ore...@trar.pbz> [2012-10-17 23:21:44 -0700]:
>>
>> However, Is level "5" in 'a' the same as level "5" in 'b' ?
>
>yes, of course.
>would anyone want to _different_ factors with identical string
>representations?!
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