[Rd] Minor quibble with eigen and La.eigen (PR#3221)

[j.c.rougier at durham.ac.uk]

Hi everyone,

It's a very minor point, but could we ensure that eigen and La.eigen
return a *matrix* for the "vectors" component of the list by including a
"drop = FALSE", as specified in the help file, ie put

    list(values = z$values[ord], vectors = if (!only.values) z$vectors[, 
        ord, drop = FALSE])

Thanks, Jonathan.

--please do not edit the information below--

Version:
 platform = i686-pc-linux-gnu
 arch = i686
 os = linux-gnu
 system = i686, linux-gnu
 status = 
 major = 1
 minor = 7.0
 year = 2003
 month = 04
 day = 16
 language = R

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