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 ?
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
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