As David says it will be good to see how the structure of the list subset is. Now I'm going to guess that the i'th element of subset is a dataframe since you are using nrow(subset[[i]]).
Now you're doing select<-which(nrow(subset[[i]])>=100) ## added a missing closing ) so now select holds the number of rows of subset[[i]] only. Perhaps it should be something like select <- which(lapply(subset, nrow) >= 100). Using some dummy data: > tmp <- > list(matrix(0,2,3),matrix(0,9,3),matrix(0,8,3),matrix(0,3,3),matrix(0,6,3)) > which((lapply(tmp, nrow) > 6)) [1] 2 3 By the way there is a function called subset so you could run into trouble later on when calling your list for subset. Yours sincerely / Med venlig hilsen Frede Aakmann Tøgersen Specialist, M.Sc., Ph.D. Plant Performance & Modeling Technology & Service Solutions T +45 9730 5135 M +45 2547 6050 fr...@vestas.com http://www.vestas.com Company reg. name: Vestas Wind Systems A/S This e-mail is subject to our e-mail disclaimer statement. Please refer to www.vestas.com/legal/notice If you have received this e-mail in error please contact the sender. > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of David Winsemius > Sent: 15. maj 2014 06:49 > To: David Gwenzi > Cc: r-help@r-project.org > Subject: Re: [R] for loop using index values > > > On May 14, 2014, at 9:23 PM, David Gwenzi wrote: > > > Hi all > > > > I have point data along a transect and I want to divide the transect > > into > > small blocks of 10m length each. I have named the blocks as a list i.e > > subset[[i]]. Now the issue is I want to process only those blocks > > that have > > at least 100 data points and keep the original index values of those > > subsets. How do I set the for loop. I have tried the following but > > it is > > still processing everything > > > > select<-which(nrow(subset[[i]])>=100 > > for (i in c(select)){ > > .............. > > } > > Thank you in advance, > > So can you provide str( subset[[1]] )? > > > > > > David Gwenzi > > Graduate Degree Program in Ecology > > Natural Resources Ecology Lab > > Colorado State University > > > > [[alternative HTML version deleted]] > > And this is a plain text mailing list as described in the Posting Guide. > > -- > > David Winsemius, MD > Alameda, CA, USA > > ______________________________________________ > 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. ______________________________________________ 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.
