Playing around with my new laptop (Macbook, 2.4Ghz), I encountered unexplained timings using system.time.
I did the following: > X <- Matrix(rnorm(1e6), 1000) > system.time(for(i in 1:25) X%*%X) user system elapsed 8.306 0.591 5.031 > system.time(for(i in 1:25) solve(X)) user system elapsed 8.933 1.331 6.684 > system.time(for(i in 1:10) svd(X)) user system elapsed 36.989 3.665 33.384 From R-News I got the following description: "The returned value consists of user time (CPU time R needs for calculations), system time (time the system is using for processing requests, e.g., for handling files), total time (how long it really took to process the command) and — depending on the operating system in use — two further elements." Do I misunderstand these timings, or is my laptop indeed capable of time travel? Kind regards, Rense -- View this message in context: http://www.nabble.com/Time-travelling-laptop%2C-or-problem-with-system.time--tp20279832p20279832.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
