try this (also look at R-FAQ 7.10): sapply(df, function (x) as.numeric(levels(x))[as.integer(x)])
I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Antje" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, December 04, 2007 11:46 AM Subject: [R] Dataframe manipulation > Hello, > > can anybody help me with this problem? > I have a dataframe, which contains its values as factors though I > have numbers > but it was read as factors with "scan". Now I would like to convert > these > columns (multiple) to a numeric format. > > > # this example creates a similar situation > > testdata <- as.factor(c("1.1",NA,"2.3","5.5")) > testdata2 <- as.factor(c("1.7","4.3","8.5",10.0)) > > df <- data.frame(testdata, testdata2) > > what do I have to do to get the same datafram but with numeric > values??? > > Antje > > ______________________________________________ > 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. > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ 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.
