?is.na

On Nov 21, 2007 12:15 PM, Eleni Christodoulou <elenichri@gmail.com> wrote:

> Hi all!
>
> I am new to R and I would like to ask you the following question:How
> can I substitute the NA values with 0 in a data frame? I cannot find a
> command to check if a value is NA...
>
> Thank you very much!
> Eleni
>
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