On Mon, 19 Jan 2004, Frank E Harrell Jr wrote: > On Mon, 19 Jan 2004 17:17:39 +0000 (GMT) > Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > > > Are you sure there is a measurable difference in calling methods > > directly? The dispatch overhead on formula (one of your uses) appears to > > be about 10 microseconds. (Note, negligible even for 10,000 > > bootstraps.) > > > > I believe we took the real performance penalties into account (and > > namespaces had performance pluses as well as minuses). > > Brian, > > I don't worry about dispatch overhead. I do worry about overhead of > assembling model matrices, removing rows with NAs, etc. -Frank
Here is what you said: > The point of calling methods directly is efficiency, otherwise I would not > use this dirty practice. When bootstrapping or otherwise calling methods and your code is failing in R-devel because you are calling formula.default. So, *why* are you calling formula.default? Calling e.g. glm.fit not glm is not to do with methods, and apparently survfit.km is not a method. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
