[R] How to know created time of object in R?

[Prof Brian Ripley]

On Tue, 6 Nov 2007, Dong-hyun Oh wrote:

> Dear UseRs,
>
> I would like to know the created time and date of specific object.
> Is there any function for it?

There isn't even the concept.  Most objects in R are a collection of 
SEXPRECs created at different times.  Suppose you create a data frame out 
of existing columns, and then later change the names? What does 'created' 
mean for the data frame?

In any case, none of the possibly relevant date-times is stored.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595