How to know in which package is a function

From: Romain Francois

Hello list,

I'd like to know if there is a function that tells in which 
package is a 
given function.
Something like :

which.package("lda")
[1] "MASS"
getAnywhere(), as Uwe suggested, will find objects that are in attached
packages.  help.search(), as Doug suggested, will find help topics among
installed packages.  To search among all CRAN (and BioC) packages, your best
best is RSiteSearch("fcn", restrict="function").  The result is not shown in
R, though.

Andy
Thank you.

Romain

-- 
~~~~~~~~ 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~
~~~~~~      Romain FRANCOIS - http://addictedtor.free.fr      
   ~~~~~~
~~~~        Etudiant  ISUP - CS3 - Industrie et Services      
     ~~~~
~~                http://www.isup.cicrp.jussieu.fr/           
       ~~
~~~~           Stagiaire INRIA Futurs - Equipe SELECT         
     ~~~~
~~~~~~   http://www.inria.fr/recherche/equipes/select.fr.html 
   ~~~~~~
~~~~~~~~ 
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To search among all CRAN (and BioC) packages, your
best best is RSiteSearch("fcn", restrict="function").
?RSiteSearch
No documentation for 'RSiteSearch' in specified packages and libraries:
you could try 'help.search("RSiteSearch")'
help.search("RSiteSearch")
No help files found with alias or concept or title matching
'RSiteSearch' using fuzzy matching.
Liaw, Andy wrote:

To search among all CRAN (and BioC) packages, your
best best is RSiteSearch("fcn", restrict="function").

?RSiteSearch
No documentation for 'RSiteSearch' in specified packages and libraries:
you could try 'help.search("RSiteSearch")'

help.search("RSiteSearch")
No help files found with alias or concept or title matching
'RSiteSearch' using fuzzy matching.
So you should try out the recent version of R (2.1.0), which contains 
RSiteSearch in package "utils".

Uwe Ligges
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