R help - Feb 2011 - Flexibly Retrieving Objects with an Index

Greetings,

I would like to flexibly combine several data frames objects without 
specifying the exact names of the objects in memory. Should I use indexing 
to call those objects out of memory? I regularly use indexes to flexibly 
extract parts of data frames and lists and to read files from my hard 
drive, but I can't figure out how to do so with stored objects.

In my case, all of the data frames of interest are formatted the same way 
and have been assigned to objects with the prefix "data.". The
following
examples combine only the names (not the objects themselves):
rbind(ls()[grep("data.", ls(), fixed=T)])
list(ls()[grep("data.", ls(), fixed=T)])

Is there a way to get ls() (or some other function) to return the object 
instead of just the name? I searched the help files and the R-help archives 
but couldn't find a solution. Thanks in advance.

Sincerely,
Chris

-- 
Christopher T. Moore, M.P.P.
Doctoral Student
Quantitative Methods in Education
University of Minnesota
44.9785?N, 93.2396?W
moor0554 at umn.edu
http://umn.edu/~moor0554

Try this:

do.call(rbind, mget(ls(pattern = 'data'), envir = .GlobalEnv))

On Wed, Feb 2, 2011 at 5:20 PM, Christopher T. Moore
<moor0554@umn.edu>wrote:
> Greetings,
>
> I would like to flexibly combine several data frames objects without
> specifying the exact names of the objects in memory. Should I use indexing
> to call those objects out of memory? I regularly use indexes to flexibly
> extract parts of data frames and lists and to read files from my hard
drive,
> but I can't figure out how to do so with stored objects.
>
> In my case, all of the data frames of interest are formatted the same way
> and have been assigned to objects with the prefix "data.". The
following
> examples combine only the names (not the objects themselves):
> rbind(ls()[grep("data.", ls(), fixed=T)])
> list(ls()[grep("data.", ls(), fixed=T)])
>
> Is there a way to get ls() (or some other function) to return the object
> instead of just the name? I searched the help files and the R-help archives
> but couldn't find a solution. Thanks in advance.
>
> Sincerely,
> Chris
>
> --
> Christopher T. Moore, M.P.P.
> Doctoral Student
> Quantitative Methods in Education
> University of Minnesota
> 44.9785°N, 93.2396°W
> moor0554@umn.edu
> http://umn.edu/~moor0554 <http://umn.edu/%7Emoor0554>
>
> ______________________________________________
> 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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