[R] More powerful than objects() or ls()

[Thomas Lumley]

On Thu, 22 Mar 2001, Patrick Connolly wrote:
>
> There are times when the date is very valuable information,
> particularly years later.  I would like to be able to do something
> similar in R but of course, the same method won't work because objects
> are not stored as separate unix files in a .Data directory.
>
> I had thought of adding a date with attr() and was then going to redo
> the function which could use that information in place of the file
> information I used in Splus.  Unfortunately, that means the date
> attibute is added to everything when displayed which is too cluttered.
>
> Then of course, I'd need to figure an easy (preferably automatic) way
> of adding the date to the objects I was interested in.  However, I was
> hoping someone might already have a better way of achieving the same
> end, and preferably without the unnecessary verbiage mentioned above.

comment() does the information management you need. There isn't an
automatic way of doing the date information and I can't think ofa general
one that wouldn't be horribly slow.  You could add a date-setting function
to your most frequnelty used object creation functions  (perhaps
read.table and glm in my case).

	-thomas

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