Rather a misleading subject, if it was slower under 1.8.1. On Thu, 22 Apr 2004, Scott Bartell wrote:
> I have an R function (about 1000 lines long) that takes more than 20 > times as long to run under R Windows 1.9.0 and 1.8.1 than it does under > 1.7.1. Profile results indicate that the $<-.data.frame operation is > the culprit, but I don't understand exactly what that is (assignment of > data frame elements to another variable?), or why it's only a problem > under 1.8.1 and 1.9.0. Any advice? Don't use $<- on data frames, that is code like foo$bar <- bah for foo a data frame, if you don't want to pay the penalty of error checking. Versions prior to R 1.8.0 treated data frames as lists for that construct, and often ended up with invalid data frames. Sound like you could use a lists for your working data. > > top 5 operations under 1.9.0 > self.time self.pct total.time total.pct > $<-.data.frame 110.64 93.3 110.68 93.3 > FMD 5.38 4.5 118.60 100.0 > DIRinf 0.54 0.5 11.82 10.0 > INDinf 0.46 0.4 9.78 8.2 > pweibull 0.38 0.3 0.38 0.3 > > top 5 operations under 1.7.1 > self.time self.pct total.time total.pct > pweibull 2.62 55.7 2.62 55.7 > ^ 0.76 16.2 0.76 16.2 > CalcDistance 0.16 3.4 1.26 26.8 > FMD 0.16 3.4 4.70 100.0 > matrix 0.14 3.0 0.14 3.0 -- 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-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
