similar to: How to duplicate rows in dataframe?

what about using "mapply"? splitted.value<-with(x.1, split(VALUE, GROUP)) splitted.freq<-with(x.1, split(FREQUENCY, GROUP)) mapply(weighted.mean, splitted.value, w=splitted.freq) Stefano >-----Messaggio originale----- >Da: r-help-bounces at stat.math.ethz.ch >[mailto:r-help-bounces at stat.math.ethz.ch]Per conto di >james.holtman at convergys.com

hi, I'd like to extract data from very large files (ca 1-2 Mio lines), and I already know which lines of these files I need. Is there a way to do it without filling the memory with the whole file content? The lines I need are randomly distributed within the files. Thanks, Marc -----Original Message----- From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at

James, thanks for the response. I understand now my puzzle. tmp <- data.frame(y1=1:4, f1=factor(c("A", "B", "C", "D"))) tmp$y2 <- NA tmp[1:2, "y2"] <- 2 Does the job. I see that I should add a full column. In my case adding full column of NAs and then adding values, solves my problems. Thanks to all. james.holtman at convergys.com

I generated a PDF output file of 10 plots. When I try to view it with Adobe reader (R4 & R5), it will lockup the reader (it is consuming 100% of the CPU) after presenting the 4th plot. I can generate the plots just fine in Windows and as a postscript file reading it with GSview. Is there anyway to tell what might be wrong with the PDF output? The file is 890KB in size if anyone would like

Hi Christian, Chuck (and lists) It seems that the problem may be the strange behaviour of 'unstack' inside a function. See this thread in the R mailing list: http://tolstoy.newcastle.edu.au/R/help/04/03/1160.html Anyway, I got round the problem by using 'aggregate' instead of converting to a list and then tapply to sum values of metric. Probably more efficient as well. Thanks

The following script works fine in R 1.9.1. It was creating a PDF file with the graphs in it. In R 2.0.0, I got the error message below. I tried the same script just outputting to Windows and postscript and the output was OK. The error message only showed up when trying to create a PDF file. > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386,

Christian, those are resource forks from your files - possibly maintained by your (likey very old?) editor. First, is seems that you are not creating the tar ball correctly - the correct way is to use R CMD build which should not include resource forks nor files on the ignore list. That said, if for some reason you intend to create is by hand (not recommended), you may want to set

I was using 'object.size' to see how much memory a list was taking up. After executing the command, I had thought that my computer had locked up. After further testing, I determined that it was taking 241 seconds for object.size to return a value. I did notice in the release notes that 'object.size' did take longer when the list contained character vectors. Is the time that it is

Dear Simon, Thank you very much for your help, it did solve my problems!! Great! I have googled COPYFILE_DISABLE and found the following site which does explain the issue with tar on Mac OS X, see: http://unix.stackexchange.com/questions/9665/create-tar-archive-of-a-directory-except-for-hidden-files Instead of doing: $tar czf xps_1.29.2.tar.gz xps I did now: $COPYFILE_DISABLE=1 tar czf

On Sep 26, 2015, at 5:06 PM, cstrato <cstrato at aon.at> wrote: > Dear Dirk, > > Yes, I know, however forget for one moment R. > > If I use tar independent of R it still should not create these hidden files. > > BTW, do you know where these hidden files are stored on the Mac? > Please consider reading my original reply - those are not actual files (all but

You reall have only one parameter in your model, c = a/b. You can't identify both a and b from your model, therefore, you should fit the linear model: lm(z ~ c* sin(x)/x) Ravi. ----- Original Message ----- From: cstrato <cstrato at aon.at> Date: Monday, February 2, 2004 2:28 pm Subject: [R] Robust nonlinear regression - sin(x)/x? > Dear all > > Since I did not receive any

promptClass fails to identify methods associated with the class. Here is a fix: Index: promptClass.R =================================================================== --- promptClass.R (revision 41719) +++ promptClass.R (working copy) @@ -165,7 +165,7 @@ if (nmeths > 0) { .meths.body <- " \\describe{" for (i in 1:nmeths) { - .sigmat

Dear all, On the CRAN website http://cran.r-project.org/ it is currently not possible to get to the packages. Clicking on "Packages" or on "Contributed extension packages" results in Error 404: Object not found!, see: http://cran.r-project.org/web/packages/ Best regards, Christian _._._._._._._._._._._._._._._._._._ C.h.r.i.s.t.i.a.n S.t.r.a.t.o.w.a V.i.e.n.n.a

Dear all, To create a *.pdf file from a *.Rnw file I do: olddir <- getwd(); setwd(outdir); tryCatch({Sweave("QAReport.Rnw"); tools::texi2pdf("QAReport.tex", clean=TRUE) }, finally = setwd(olddir) ); This works fine, however 'clean=TRUE' does only work when: outdir <-

Dear all, Since many years the following C++ code does compile on ALL Bioconductor servers (Linux, Windows, Mac) without any warnings: Int_t numsels = 0; //number of selected entries ... for (Int_t i=0; i<size; i++) { numsels = (arrMask[i] == 1) ? ++numsels : numsels; }//for_i Even on the recently added release server 'zin2' Linux (Ubuntu 12.04.4 LTS) the

Dear all, For certain reasons I have to compile the source code of my package on Windows XP using Microsoft Visual Studio 9.0, thus I had to create a "Makefile.win". Now I have a question regarding compiler options /MT vs /MD for Makefile.win. The following partial output shows that when building my package on Windows XP using "R CMD build --binary xps" with compiler

Dear Duncan, In your document "readme.packages.txt" you have a very helpful chapter on "Using Visual C++". Please allow me to ask you one question: Why do you propose the option "/MT" instead of option "/MD"? (To my knowledge usually option "/MD" is used when compiling programs with VC++.) Best regards Christian

Dear Debian/Ubuntu experts, For the second time users of my BioC package reported problems when trying to compile it on Debian/Ubuntu. The error is always the same: "'wcstombs' was not declared in this scope", see: https://www.stat.math.ethz.ch/pipermail/bioconductor/2010-February/031739.html https://stat.ethz.ch/pipermail/bioconductor/2009-August/029192.html Since I have no

Dear all, Since my package is based on S4 classes, I would like to know how to add a slot to an existing S4 class without breaking the code of users of my package. Assume the following S4 class: setClass("MyClass", representation(name = "character", type = "character", data = "data.frame" ), prototype(name =

Dear all, I am just writing the documentation file for S4 class 'QualTreeSet' and get the following warning with R CMD check: * checking for missing documentation entries ... WARNING Undocumented S4 methods: generic 'initialize' and siglist 'QualTreeSet' All user-level objects in a package (including S4 classes and methods) should have documentation entries. See the