Hi > I made some design matrix X(in linear regression model) > > I there any method to normalize X?
You can normalize a matrix column-wise like this: # m is a matrix apply(m, 2, function(x) x / max(x) ) Or normalize row-wise like this: t(apply(m, 1, function(x) x / max(x) )) I'm sure there are more elegant ways to do it but those work for me. Michael ______________________________________________ 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.
