[R] load object

[Weiwei Shi]

Hi,
thanks for everyone.
I think function "get" is what I wanted.
?get returns like:
Description:
Search for an R object with a given name and return
it.

Actually I need such reference to handle this obj.
Sorry if there is a misleading description in my
previous email.

weiwei

--- Ray Brownrigg <ray at mcs.vuw.ac.nz> wrote:

> > From: Douglas Bates <bates at wisc.edu> Fri Jan 14
> 08:35:33 2005
> > 
> > Weiwei Shi wrote:
> > > Hi,
> > > I happen to re-write my codes to save memory and
> my
> > > approach is write my obj into file first and
> later I
> > > load it.
> > > 
> > > However, it seems like:
> > > load(filename) can load the object but the
> function
> > > returns the name of the object instead of the
> > > reference to it. For example, I have an object
> called
> > > r0.prune, which is saved by
> > > save(r0.prune, file='r0.prune')
> > > 
> > > and later, I want to load it by using:
> > > load('r0.prune')
> > > but I need to put the reference to the object
> r0.prune
> > > into a var or a list. I tried:
> > > t<-load('r0.prune'),
> > > and class(t) gave me a char, which means t
> stores the
> > > name of obj instead of the obj itself.
> > > 
> > > Sorry for the dumb question but please help...
> > > 
> > > Weiwei
> > 
> > I was going to suggest that you read the help page
> for load but when I 
> > looked at it myself I found that it was not
> obvious what the effect of 
> > calling load at the prompt is.  The help page is
> accurate but it is a 
> > bit confusing if you don't know what the default
> environment is.
> > 
> > Anyway, when called from the prompt, load has the
> side effect of loading 
> > the object into the global environment.  Try
> > 
> Well ?load does say:
> Value:
> 
>      A character vector of the names of objects
> created, invisibly.
> 
> Note the plurals.  The point is that the file being
> loaded may contain
> the definition of more than one R object.  You can
> say:
> tt <- get(load('r0.prune'))	# t is not a good
> example name to use
> which will do what you want, but:
> 1) load() has a side-effect of also creating
> r0.prune (in your case)
> 2) if the file 'r0.prune' contains more than one
> object, only the first
> is assigned to tt (but all of them are loaded into
> memory with their
> original names).
> 
> Hope this helps,
> Ray Brownrigg
>