R help - Mar 2009 - how to identify a symbol is defined from which package

Hi list,

I encountered a situation that a data frame is defined by two packages. Both of
them are loaded by library(). My questions are

1. How could I tell the data frame is from which package?
2. If I want to reference the data frame from package A insted of B, how can I
do it?

Thanks!
hshen

hong shen <hshen_1998 <at> yahoo.com> writes:
> 
> I encountered a situation that a data frame is defined by two packages.
Both
of them are loaded by library().
> 2. If I want to reference the data frame from package A insted of B, how
can I
do it?

Either change the loading sequence of library(). Or, if you want both, use

library(a)
aFrame = theFrame
library(b)
bFrame = the Frame # This step not really required

Dieter

hong shen wrote:
> Hi list,
>
> I encountered a situation that a data frame is defined by two packages.
Both of them are loaded by library(). My questions are
>
> 1. How could I tell the data frame is from which package?
>   
find("theName")

will tell you where it found a variable called theName.
> 2. If I want to reference the data frame from package A insted of B, how
can I do it?
>   
A::theName

or

B::theName

will find whichever one you want.

Duncan Murdoch
> Thanks!
> hshen
>
> ______________________________________________
> R-help at 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.
>

A::thename works only when thename is exported by the name space A.
A:::thename works only when thename is defined in the name space A.

getAnywhere(thename)$objs$"package:A" always works.

On Mar 25, 6:48?am, Duncan Murdoch <murd... at stats.uwo.ca>
wrote:
> hong shen wrote:
> > Hi list,
>
> > I encountered a situation that a data frame is defined by two
packages. Both of them are loaded by library(). My questions are
>
> > 1. How could I tell the data frame is from which package?
>
> find("theName")
>
> will tell you where it found a variable called theName.
>
> > 2. If I want to reference the data frame from package A insted of B,
how can I do it?
>
> A::theName
>
> or
>
> B::theName
>
> will find whichever one you want.
>
> Duncan Murdoch
>
> > Thanks!
> > hshen
>
> > ______________________________________________
> > R-h... at r-project.org mailing list
> >https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting
guidehttp://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-h... at r-project.org mailing
listhttps://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.