[Rd] require is to suggests as what is to imports?

[Hadley Wickham]

Hi all,

If a package suggests another package in its description, you can
check it at runtime with requires.  How do you do check if a package
is available without loading it, if you only want to access one
function in the package namespace.

Thanks,

Hadley

-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/