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.
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/
>
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