[R] is library loaded

John Fox jfox at mcmaster.ca
Tue Sep 13 22:11:32 CEST 2005

Dear Omar,

The following function tests whether a package is in the search path (with
the package name given in quotes):

packageLoaded <- function(name) 0 != length(grep(paste("^package:", name,
"$", sep=""), search()))

I hope this helps,

John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Omar Lakkis
> Sent: Tuesday, September 13, 2005 2:09 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] is library loaded
> Is there a way to test if a library has been loaded?
> is.loaded does not give me what I want, I am looking to say:
> if loaded(Rdbi) dbSendQuery(conn, q)
> if loaded(RODBC) sqlQuery(conn, q)
> I need this to support both unix and windows platforms as I 
> could not find a windows distribution for RdbiPgSQL. I am 
> using R 2.1.0 and postgresql. I will be connecting to the 
> database using Rdbi and RdbiPgSQL and have other developers 
> using windows connect with RODBC, unless someone can suggest 
> a better solution.
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