round up a number to 10^4
Also be aware of the IEEE standard of rounding to even:
round(61000, -4)
[1] 60000
round(62000, -4)
[1] 60000
round(65000, -4)
[1] 60000
round(66000, -4)
[1] 70000
round(76000, -4)
[1] 80000
round(75000, -4)
[1] 80000
notice what 65000 rounds to and what 75000 rounds to.
On Tue, Nov 1, 2011 at 4:13 PM, Bert Gunter <gunter.berton at gene.com> wrote:
Yes, I agree with David that this looks like an error. However, for fun, one might ask: what is the fewest number of R elementary math operations that would produce such a result -- this might be good for clever 6th or 7th graders, for example. For here, I leave this as an exercise for the reader. -- Bert On Tue, Nov 1, 2011 at 12:42 PM, David Winsemius <dwinsemius at comcast.net>wrote:
On Nov 1, 2011, at 1:07 PM, Wendy wrote: ?Hi all,
I have a list of numbers, e.g., X = c(60593.23, 71631.17, 75320.1), and want to round them ?so the output is Y = c(60000, 80000, 80000).
Under what notion of "rounding" would that be the result? ?I tried
Y<-round(X,-4), but it gives me Y = c(60000, 70000, 80000). Do anybody know how to round up a number to 10^4? Thank you in advance.
-- David Winsemius, MD Heritage Laboratories West Hartford, CT
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