Jim, I understand that that do.call will combine all the lists into a matrix. But I have a list,x, which is a list of a list as in x[[1]] and x[[2]] which are themselves lists. Then using do.call(rbind, x) would combine both x[[1]] and x[[2]] into a matrix. I want to keep x[[1]] and x[[2]] separately into their own matrix, and so I am putting do.call into a loop ie. do.call(rbind,x[[i]]) to keep them separate. More elegantly I would want to put do.call into lapply but have not been successful to do this. Lana
-----Original Message----- From: jim holtman [mailto:[EMAIL PROTECTED] Sent: Monday, June 16, 2008 5:24 PM To: Lana Schaffer Cc: hadley wickham; r-help@r-project.org Subject: Re: [R] alternative to matching/merge? Is this what you tried: > x <- data.frame(a=1:10, b=1:10) > x <- data.frame(a=1:3, b=1:3) > do.call(rbind, list(x,x,x,x,x)) a b 1 1 1 2 2 2 3 3 3 4 1 1 5 2 2 6 3 3 7 1 1 8 2 2 9 3 3 10 1 1 11 2 2 12 3 3 13 1 1 14 2 2 15 3 3 > On Mon, Jun 16, 2008 at 7:36 PM, Lana Schaffer <[EMAIL PROTECTED]> wrote: > Jim, > Is it possible to do a do.call(rbind,d.frame) with a list like using > lapply(data,func,args)? > I have not successfully executed this. > Lana > > -----Original Message----- > From: hadley wickham [mailto:[EMAIL PROTECTED] > Sent: Friday, June 13, 2008 2:54 PM > To: jim holtman > Cc: Lana Schaffer; r-help@r-project.org > Subject: Re: [R] alternative to matching/merge? > > On Fri, Jun 13, 2008 at 11:45 AM, jim holtman <[EMAIL PROTECTED]> > wrote: >> What is the structure of 'd.frame' and 'segFile'? Run Rprof so that >> we can see which of the functions it is spending its time in. What >> happens if x$index is not in seqFile$index? Are the values in the >> 'index' unique in both structures? Subsetting a data frame can be >> expensive when compared to using a matrix. Could you use a matrix >> instead of a data frame; are all the columns the same mode? Again >> either a subset of data would be helpful or an 'str' on the data >> objects being used so that we can understand what they are. > > A few other ideas to try: > > * try merging do.call("rbind", d.frame) and seqFile, and then > spliting the results back up > > * try turning giving seqFile rownames (rownames(seqFile) <- > seqFile$index) and then use character matching: cbind(x, seqFile[ > as.character(x$index)] > > * if there is a one to one corresponding between index in seqFile and > all data.frames in d.frame, merge all of the d.frames together, order > both by index then just cbind > > Hadley > > > -- > http://had.co.nz/ > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.
