try the following: out <- data.matrix(d) dimnames(out) <- NULL out
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://www.med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm ----- Original Message ----- From: "Muhammad Subianto" <[EMAIL PROTECTED]> To: <r-help@stat.math.ethz.ch> Sent: Thursday, April 06, 2006 4:16 PM Subject: [R] convert a data frame to matrix - changed column name >I have a question, which very easy to solve, but I can't find a >solution. > I want to convert a data frame to matrix. Here my toy example: > >> L3 <- c(1:3) >> L10 <- c(1:6) >> d <- data.frame(cbind(x=c(10,20), y=L10), fac=sample(L3, + 6, >> repl=TRUE)) >> d > x y fac > 1 10 1 1 > 2 20 2 1 > 3 10 3 1 > 4 20 4 3 > 5 10 5 2 > 6 20 6 2 >> is.data.frame(d) > [1] TRUE >> sapply(d, function(x) unlist(x, use.names=FALSE)) > x y fac > [1,] 10 1 1 > [2,] 20 2 1 > [3,] 10 3 1 > [4,] 20 4 3 > [5,] 10 5 2 > [6,] 20 6 2 >> is.matrix(sapply(d, function(x) unlist(x, use.names=FALSE))) > [1] TRUE >> > > Yes, I get a matrix TRUE. But I need to change a column name like > [,1] > [,2] [,3]. I need the result like > > [,1] [,2] [,3] > [1,] 10 1 1 > [2,] 20 2 1 > [3,] 10 3 1 > [4,] 20 4 3 > [5,] 10 5 2 > [6,] 20 6 2 > > How can I do that? > Thanks in advance, Muhammad Subianto > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html