On Mon, Apr 14, 2008 at 09:47:49PM +0800, Ng Stanley wrote:
> Hi,
>
> Two questions:
>
> A) I need to initialize many variables to NULL. So I created variable_names
> <- c("a1", "a2"). What can I do to variable_names so that variable a1 is
> NULL and a2 is NULL ?
for (n in variable_names) assign(n, NULL)
> B) How can I check whether an object exist ?
help.search("exists")
G.
> Thanks
> Stanley
>
> [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
--
Csardi Gabor <[EMAIL PROTECTED]> UNIL DGM
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
