Hi, I'm trying to create a model.matrix (or use lm, which result in the same issue), using a logical data matrix. When I use a numerical matrix, I can do:
numeric_mat<-matrix(c(1,2,3,4),c(2,2)) model.matrix(~numeric_mat) and it works well. When I use logical matrix: logic_mat<-matrix(c(TRUE,FALSE,FALSE,TRUE),c(2,2)) #The following works: model.matrix(~logic_mat[,1]+logic_mat[,2]) #but this fails: model.matrix(~logic_mat) Any hint? Thanks, Ehud ______________________________________________ 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.
