> I have a matrix x with repeating row names. > zz<-matrix(0,4,4) > > rownames(zz)=c("a","a","b","b") > > data.frame(zz) (?)
The row names on a data frame should be unique. You can try as.data.frame(xx, row.names=FALSE) to convert zz to be a data frame. If you need the row name information, add it as a column in the data frame, e.g. mydataframe$rnames <- rownames(zz). (Note to R-Core: the documentation for as.data.frame doesn't mention the usage of row.names=FALSE to ignore row names, but it seems to work consistently. Does the help page for as.data.frame need updating?) > lm(as.formula(paste("final_dat[,5]~",paste(colnames(x),collapse="+"))),x > ) > > this gives me a error > Error in model.frame.default(formula = > as.formula(paste("final_dat[,5]~", : > > 'data' must be a data.frame, not a matrix or an array I suspect that if you try class(x), it will be a matrix, not the requisite data frame. Regards, Richie. Mathematical Sciences Unit HSL ------------------------------------------------------------------------ ATTENTION: This message contains privileged and confidential inform...{{dropped:20}} ______________________________________________ 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.