> > Also, you probably get less data copying by using a for() or while() loop > than by using apply() in this context.
Why may there be less data copying with "for" and "while" compared to apply? > > Finally, the overhead of formula parsing and model matrix construction > repeated thousands of times probably dominates this computation; if it isn't > just a one-off it would probably be worth a lower-level implementation. > Does "lower-level implementation" mean code this outside of R. Thanks! Juliet ______________________________________________ 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.
