data.frame(v1, I(v2))
-roger
Erich Neuwirth wrote:
typeof applied to a factor always seems to return "integer", independently of the type of the levels. This has a strange side effect. When a variable is "imported" into a data frame, its type changes. character variables automatically are converted to factors when imported into data frames.
Here is an example:
> v1<-1:3 > v2<-c("a","b","c") > df<-data.frame(v1,v2) > typeof(v2) [1] "character" > typeof(df$v2) [1] "integer"
It is somewhat surprising that the types of v2 and df$v2 are different.
the answer is to do levels(df$v2)[df$v2] but that is somewhat involved.
Should the types not be identical, and typeof applied to factors return the type of the levels?
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