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wcast
2007 Apr 19
0
Feature request for 'sprintf' optimization (PR#9621)
...ith a suggestion for significant optimization.
First, consider a data.frame with numeric (double) values:
dat <- data.frame(year=as.numeric(rep(1970:2000,each=365)),
yday=as.numeric(1:365))
nrow(dat)
Consider using 'sprintf' in R with and without casting the arrays:
wocast <- system.time(with(dat,sprintf("%04i-%03i",year,yday)))
wcast <- system.time(with(dat,sprintf("%04i-%03i",as.integer(year),
as.integer(yday))))
100*wocast/wcast # as a percent comparison
My results on a Debian VM with R...