expand.grid returns vector for single arg (PR#319)

[cberry@tajo.ucsd.edu]

<<insert bug report here>>

IMHO,

expand.grid(1:3)

should return an object of class "data.frame".

Instead I get 

> class(expand.grid(1:3))
NULL

Chuck Berry

--please do not edit the information below--

Version:
 platform = sparc-sun-solaris2.7
 arch = sparc
 os = solaris2.7
 system = sparc, solaris2.7
 status = Release
 major = 0
 minor = 65.1
 year = 1999
 month = October
 day = 07
 language = R

Search Path:
 .GlobalEnv, package:Rbqtl, Autoloads, package:base

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