[R] problem with NA and if

[Albert Greinoecker]

try
is.na()

regards,
Albert

Am Freitag, den 04.07.2008, 08:29 +0200 schrieb Keld Jørn Simonsen:
> 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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