Hi Lei, Thanks for your solution. It worked. Now I have another query. After creating multiple DF[[i]]'s how do I aggregate them into one data frame say DF (I want to bind all the data frames into one data frame). I have more than 1000 DF[[i]]'s how can I bind them into one DF by recursively?
Thanks for your help. Regards, Madana From: Lei Jiang [via R] [mailto:ml-node+3688529-54131105-22...@n4.nabble.com] Sent: Saturday, July 23, 2011 1:43 PM To: Madana Mohana Babu Subject: Re: R on Multicore for Linux Madana, The code below may work (untested though): #above is the same as you wrote require(multicore) read.data.exmple <- function(f) { dat <- read.csv(f, header=FALSE, sep="\t", na.strings="",dec=".", strip.white=TRUE, fill=TRUE) data_1 <- sqldf("SELECT V2, V14, MIN(V16) FROM dat WHERE V6=104 GROUP BY V2, V14") data_1 } DF <- mclapply(a, read.data.example) #you can check the components of DF by DF[[1]], DF[[2]] ..., which is a bit different from rbind #feel free to add more arguments to function read.data.example and add those to mclapply accordingly Hope this helps. Regards, Lei On Fri, Jul 22, 2011 at 11:35 AM, Madana_Babu <[hidden email]</user/SendEmail.jtp?type=node&node=3688529&i=0>>wrote: > Hi, > > Can you please explain me that how can i perform this on a multicore > processor? since i have a machine with 16-cores. I can do this much faster > if i use all cores. > > Thanks in advance... > > Regards, > Madana > > -- > View this message in context: > http://r.789695.n4.nabble.com/R-on-Multicore-for-Linux-tp3682318p3687483.html > Sent from the R help mailing list archive at Nabble.com. > [[alternative HTML version deleted]] > > ______________________________________________ > [hidden email]</user/SendEmail.jtp?type=node&node=3688529&i=1> 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. > -- Lei Jiang Center for Computation and Technology/ Department of Computer Science Louisiana State University E-mail: [hidden email]</user/SendEmail.jtp?type=node&node=3688529&i=2> [[alternative HTML version deleted]] ______________________________________________ [hidden email]</user/SendEmail.jtp?type=node&node=3688529&i=3> 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. ________________________________ If you reply to this email, your message will be added to the discussion below: http://r.789695.n4.nabble.com/R-on-Multicore-for-Linux-tp3682318p3688529.html To unsubscribe from R on Multicore for Linux, click here<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=3682318&code=bWFkYW5hX2JhYnVAaW5mb3N5cy5jb218MzY4MjMxOHwxMzY2NzI1OTQ5>. **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS*** -- View this message in context: http://r.789695.n4.nabble.com/R-on-Multicore-for-Linux-tp3682318p3690669.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] ______________________________________________ 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.
