Hi r-help-boun...@r-project.org napsal dne 20.10.2010 07:58:29:
> Hi Josh, > What I'm really trying to do is to refer to objects whose names I have > stored in a vector. This example was arbitrary. > I do a lot of looping through files in the working directory, or through > objects in the namespace, and I'm confused about how best to call upon them > from within a loop. Why not create those objects as part of list and loop though list. regards Petr > Thanks, > Dan > > On Wed, Oct 20, 2010 at 4:46 PM, Joshua Wiley <jwiley.ps...@gmail.com>wrote: > > > Hi Daniel, > > > > get() will work for any object, but cat() may not. cat() should work > > for arrays, but it will be messy even for relatively small ones. For > > example, run: > > cat("Hello", array(1:100, dim = c(10, 10)), sep = " ") > > > > What are you really trying to do? If you are just trying to figure > > out what random variables in your workspace you've assigned but do not > > know/forgot what they are, consider: > > > > ls.str(pattern="^obj") > > > > as a better way to get their names and some useful summaries > > (including class and number of observations). > > > > HTH, > > > > Josh > > > > On Tue, Oct 19, 2010 at 10:29 PM, Daniel Weitzenfeld > > <dweitzenf...@gmail.com> wrote: > > > # Let's say I have 5 objects, object_1, object_2, etc. > > > for (i in 1:5) { > > > assign(paste("object_",i, sep=""), i+500) > > > } > > > > > > # Now, for whatever reason, I don't know the names of the objects I've > > > created, but I want to operate on them. > > > list<-ls(pattern="^obj") > > > > > > #Is get best? > > > for (l in list) { > > > cat("\n", l, "is", get(l), sep=" ") > > > } > > > > > > Is get() the correct command to use in this situation? What if rather > > than > > > just an integer, object_1 etc are large arrays - does that change the > > > answer, for speed reasons? > > > > > > Thanks in advance, > > > Dan > > > > > > [[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. > > > > > > > > > > > -- > > Joshua Wiley > > Ph.D. Student, Health Psychology > > University of California, Los Angeles > > http://www.joshuawiley.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. ______________________________________________ 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.