I have an additional question concerning to this topic. I usually use something liek that:
read.table(****, colClasses=c("numeric", "factor", "character", "my.funny.class")) but why can I not implement "ordered.factor" in there? Birgit Kenn Konstabel wrote: > > Conversion to factor may happen (and often does) when you read in data > with > read.table(). So one solution may be reading in the same data again in a > slightly different way: > > read.table(file="mydatafile", as.is=TRUE) > # see also ?read.table > > You can also specify a class to each column of the data you're about to > read > in: > read.table(****, colClasses=c("numeric", "factor", "character", > "my.funny.class")) > > > Ad take a look at http://cran.r-project.org/doc/FAQ/R-FAQ.html p. > 7.10 > for the right answer -- in any case, don't use as.numeric(x)! > > Kenn > > > On Thu, Jun 12, 2008 at 9:24 AM, Qman Fin <[EMAIL PROTECTED]> wrote: > >> Hi all, >> >> I have some data x, which are actualy consisted of numerical enties. But >> the >> class of this matrix is set to be "factor" by someone else. I used >> "class(x)", it turns out to be "factor". So I can not calculate them. >> >> How can I turn them into numerical data so that I can apply math >> operations >> on them? Thanks a lot for your help. >> >> Selina >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > ----- The art of living is more like wrestling than dancing. (Marcus Aurelius) -- View this message in context: http://www.nabble.com/How-to-change-the-class-of-data--tp17793351p17795106.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.