Re: [R] Initialize many variables to NUL, check whether an object exist

From: Gabor Csardi <csardi_at_rmki.kfki.hu>
Date: Mon, 14 Apr 2008 15:53:51 +0200

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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-- 
Csardi Gabor <csardi_at_rmki.kfki.hu>    UNIL DGM

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Received on Mon 14 Apr 2008 - 16:37:56 GMT

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