[R-SIG-Finance] Converting factors back to numbers in R

John C. Frain frainj at tcd.ie
Tue Dec 5 16:15:27 CET 2006

The html help file for factors gives

To “revert” 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)).

John C. Frain.
Economics Department
Trinity College Dublin
Dublin 2

mailto:frainj at tcd.ie

Quoting ÒÏ×ÅÎ áËØÁÔÏÉ <volchik2000 at list.ru>:

> Hi everybody,
> i've spent a lot of time trying to fix the following problem:
> i'm trying to load into R several dataframes with stocks data through:
> dat<-lapply(1:Number.of.contracts,function(x) {
>    print(Names[x])
>    read.csv(paste(WorkingDirectory,Names[x],
>    })
> Because the header are times in the format "HH:MM" R converts them to
> strings, changing in the way. It's now a problem, i can fix it using sub
> (gsub) functions.
> Problem is that R converts prices to factors as well even though i have
> option as.is=T set, and then it almost impossible to convert them back to
> double preserving the row.names (these are dates) and column names (times),
> probably because of the structure i store them in (list of dataframes).
> I suspect there is an easy way to solve this problem, but couldn't figure it
> out :(
> Thanks
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