I believe that's intentional. NA means we don't know what the value is,
so
just about any operation with NA will result in NA. You might think
anything times 0 is 0, but:
> 0*Inf
[1] NaN
and there's no guarantee that the "true" value not observed is not
Inf...
Andy
> From: BORGULYA G??bor
>
> Hi list!
>
> Debuging one of my R programs I found:
>
> > 0 * NA
> [1] NA
>
> It this a bug, or intentional? I would expect 0 or 0.0
> depending on the type
> of the NA.
>
> Gabor
>
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