f<-as.factor(c(1,1,2,2,3,3,3)) model.matrix(~f-1) Patrik Waldmann <Patrik.Waldmann <at> genfys.slu.se> writes:
: : Hello again, : : I was too quick before. What I was looking for was a function that : constructs the design (or incidence) matrix (X in a linear model) from a : factor. Uwe Ligges suggested using model.matrix and this does almost what I : want, but it is first necessary to construct a data variable. It also asigns : ones to all rows of the first column (because this is set to be the : contrast, not really what I want - see below). Maybe time for a function : that just converts a factor into a design matrix? : : I have a factor : factor<-as.factor(c(1,1,2,2,3,3,3)) : : and I want a matrix : 1 0 0 : 1 0 0 : 0 1 0 : 0 1 0 : 0 0 1 : 0 0 1 : 0 0 1 : : : Patrik Waldmann########################################### : : This message has been scanned by F-Secure : Anti-Virus for Microsoft Exchange. : : ########################################### : : ______________________________________________ : R-help <at> stat.math.ethz.ch mailing list : https://www.stat.math.ethz.ch/mailman/listinfo/r-help : PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html : : ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
