From simon.urbanek at r-project.org  Thu Sep 18 04:46:30 2014
From: simon.urbanek at r-project.org (Simon Urbanek)
Date: Wed, 17 Sep 2014 22:46:30 -0400
Subject: [Rd] Can't Find Function After requireNamespace
In-Reply-To: <1411005606101.35889@uni.sydney.edu.au>
References: <1411005606101.35889@uni.sydney.edu.au>
Message-ID: <F7DA7657-4AA4-4393-9DC8-9B33EFE7E935@r-project.org>


On Sep 17, 2014, at 10:00 PM, Dario Strbenac <dstr7320 at uni.sydney.edu.au> wrote:

> I have a simple function :
> 
> f <- function()
> {
>  if(requireNamespace("ggplot2"))
>    qplot(Sepal.Length, Petal.Length, data = iris, color = Species)
>  else
>    message("No graphics, just text.")
> }
> 
> ggplot2 is in the Suggests field of the DESCRIPTION file. When I load the package, and run the function, I get an error :
> 
>> f()
> Loading required namespace: ggplot2
> Error in f() : could not find function "qplot"
> 
> I don't want all ggplot2 functions to be added to the search path, so I am not using require(ggplot2). How can I use it correctly ?
> 

ggplot2::qplot(Sepal.Length, Petal.Length, data = iris, color = Species)

Cheers,
S


> R version 3.1.1 (2014-07-10)
> Platform: x86_64-unknown-linux-gnu (64-bit)
> 
> --------------------------------------
> Dario Strbenac
> PhD Student
> University of Sydney
> Camperdown NSW 2050
> Australia
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 



[Rd] Can't Find Function After requireNamespace
Simon Urbanek