Re: [R] problem with NA and if

From: Andrew Robinson <A.Robinson_at_ms.unimelb.edu.au>
Date: Fri, 04 Jul 2008 16:44:53 +1000

Hi Keld

you should read ?sum.

sum(c(1,2,NA), na.rm=TRUE)

Cheers

Andrew

On Fri, Jul 04, 2008 at 08:29:34AM +0200, Keld J?rn Simonsen wrote:
> Hi
>
> I would like to sum a number of time series, some of them having NA's
>
> Standard action is here that if I sum a value with a NA, then the result
> is NA. I would like it to just keep the value.
>
> I then try to:
>
> a = NA; if (a == NA) { a = 0}
>
> just to try it out, but it says
>
> Error in if (a == NA) { : missing value where TRUE/FALSE needed
>
> What is wrong, and can I do it smarter? I looked at na.action but I
> don't see how it affects addition of vectors, nor time series.
>
> Best regards
> keld
>
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-- 
Andrew Robinson  
Department of Mathematics and Statistics            Tel: +61-3-8344-6410
University of Melbourne, VIC 3010 Australia         Fax: +61-3-8344-4599
http://www.ms.unimelb.edu.au/~andrewpr
http://blogs.mbs.edu/fishing-in-the-bay/

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Received on Fri 04 Jul 2008 - 06:56:18 GMT

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