On 07/02/2010 6:05 PM, Chris Seidel wrote:
Hi Charlie,
get() will return the contents (value) of a variable. But what I want is
to save the named object. Something like save(get(myobjectname), ...)
doesn't work.
I think you want
save(list=myobjectname, file= ...)
assuming that the object has already been created with that name. If it
hasn't, you'll need two steps:
assign( myobjectname, value)
save(list=myobjectname, file=...)
These could be wrapped in local( { ... } ) if you are worried that
myobjectname might be the name of an object you want to keep. For example,
x <- 1 # Create a variable I don't want to mess with
name <- "x" # choose a name to save under
local({ assign(name, 2) ; save(list=name, file="test.Rdata") })
# That created test.Rdata with x equal to 2
Duncan Murdoch
In the environment, is that object of interest, and a variable which
holds the name of the object of interest. If you don't know the name of
the object, but only the variable which contains it's name, how do you
use that information to save the object?
-Chris
________________________________________
From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On
Behalf Of Sharpie [ch...@sharpsteen.net]
Sent: Sunday, February 07, 2010 4:13 PM
To: r-help@r-project.org
Subject: Re: [R] using a variable name stored in another variable?
Chris Seidel wrote:
Hello,
I'm trying to figure out how to create a data object, and then save it
with a user-defined name that is input as a command line argument. I
know how to create the object and assign it the new name, however, I
can't figure out how to refer to the new name for a future operation
such as save().
..snip..
You probably want the get() function:
get( myobjectname )
The help page for get() has a note which states that it is the compliment of
assign(). Perhaps a similar note should be added to the help page for
assign...
Hope this helps!
-Charlie
--
______________________________________________
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.
