Dear R experts--- Has anyone written parallel versions of "by" (i.e., mcby) and "ave" (i.e. mcave) ? I did ask a question like this a year ago, and then the answer was no. for those who are googling the group for the answer to this question, in the meantime, the poor man's version of "by" is mclapply( split( ds, factor ), FUN ) I don't know the poor man's version of "ave". sincerely, /iaw ---- Ivo Welch (ivo.welch at gmail.com) http://www.ivo-welch.info/
parallelized version of "by" and "ave"
3 messages · ivo welch, David Winsemius, Gabor Grothendieck
'split' works on vectors , too.
David. Sent from my iPhone On Dec 24, 2012, at 10:25 AM, ivo welch <ivo.welch at gmail.com> wrote: > Dear R experts--- > > Has anyone written parallel versions of "by" (i.e., mcby) and "ave" > (i.e. mcave) ? I did ask a question like this a year ago, and then > the answer was no. > > for those who are googling the group for the answer to this question, > in the meantime, the poor man's version of "by" is mclapply( split( > ds, factor ), FUN ) > > I don't know the poor man's version of "ave". > > sincerely, /iaw > ---- > Ivo Welch (ivo.welch at gmail.com) > http://www.ivo-welch.info/ > > ______________________________________________ > 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.
On Mon, Dec 24, 2012 at 1:25 PM, ivo welch <ivo.welch at gmail.com> wrote:
Dear R experts--- Has anyone written parallel versions of "by" (i.e., mcby) and "ave" (i.e. mcave) ? I did ask a question like this a year ago, and then the answer was no. for those who are googling the group for the answer to this question, in the meantime, the poor man's version of "by" is mclapply( split( ds, factor ), FUN ) I don't know the poor man's version of "ave".
For ave, just parallelize the lapply in this (taken from the ave source): split(x, g) <- lapply(spllit(x, g), FUN) -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com