R help - Dec 2009 - Rounding a Measurement to be Consistent with its Uncertainty

I have a measurement of 8165.666 and an uncertainty of 338.9741 (the units of
both are unimportant). I can easily round the uncertainty to two significant
digits with signif(338.9741,2), which gives 340. Is there a function in R
that will take 8165.666 and round it to be consistent with its uncertainty,
i.e., 8170?

Tom
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Tom La Bone wrote:
> I have a measurement of 8165.666 and an uncertainty of 338.9741 (the units
of
> both are unimportant). I can easily round the uncertainty to two
significant
> digits with signif(338.9741,2), which gives 340. Is there a function in R
> that will take 8165.666 and round it to be consistent with its uncertainty,
> i.e., 8170?
That's not consistent, you have 3 significant digits here, but 2 for the 
"uncertainty" (whatever that is) ...

Uwe Ligges

> 
> Tom