Re: [R] Age of an object?

From: Martin Maechler <maechler_at_stat.math.ethz.ch>
Date: Wed 14 Dec 2005 - 20:47:14 EST

>>>>> "Trevor" == Trevor Hastie <hastie@stanford.edu>
>>>>> on Tue, 13 Dec 2005 12:51:34 -0800 writes:

    Trevor> It would be nice to have a date stamp on an object.

    Trevor> In S/Splus this was always available, because objects were files.

   [are you sure about "always available"?     In any case, objects were not single files anymore for a     long time, at least for S+ on windows, and AFAIK also on     unixy versions recently ]

This topic has come up before.
IIRC, the answer was that for many of us it doesn't make sense most of the time:

If you work with *.R files ('scripts') in order to ensure reproducibility, you will rerun -- often source() -- these files, and the age of the script file is really more interesting. Also, I *always* use the equivalent of q(save = "no") and almost only use save() to particularly save the results of expensive computations {often, simulations}.

    Trevor> I have looked around, but I presume this information is not available.

I assume you will get other answers, more useful to you, which will be based on a class of objects which carry an 'creation-time' attribute.

Martin Maechler, ETH Zurich



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