Hi r-help-bounces at r-project.org napsal dne 30.04.2010 23:11:54:
Hello David, On Apr 30, 2010, at 11:00 PM, David Winsemius wrote:
Note: Loops may be just as fast or faster than apply calls.
How come!? is this true also for other similar functions: lapply, tapply
and sapply?
Then the only advantage of these above is only syntactic sugar?
Yes and no. If your loop(s) is poorly written it can be much slower then *apply operator but usually not from loop point of view but from the code itself. Regards Petr
indices <- replicate(B,sample(1:N, size=N, replace=TRUE)) theta_star <- apply(indices,2,statistic,data)
Why not: theta_star <- apply(indices,2, function(x) statistic(data, x) ) May end up as a data class that needs further work, depending on what
"statistic" return.
Nice! thank you! Best regards, Giovanni
______________________________________________ R-help at 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.