home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.math
- Path: sparky!uunet!stanford.edu!CSD-NewsHost.Stanford.EDU!Xenon.Stanford.EDU!michaelg
- From: michaelg@Xenon.Stanford.EDU (Michael Greenwald)
- Subject: Re: Rounding Rules
- Message-ID: <michaelg.724977921@Xenon.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Organization: CS Department, Stanford University, California, USA
- References: <1992Dec20.003018.14325@sol.ctr.columbia.edu> <LOTTO.92Dec21062820@math.math.berkeley.edu> <1992Dec21.204719.16970@massey.ac.nz>
- Date: 21 Dec 92 22:45:21 GMT
- Lines: 17
-
- news@massey.ac.nz (USENET News System) writes:
-
- >In article <LOTTO.92Dec21062820@math.math.berkeley.edu>, lotto@math.berkeley.edu (Ben Lotto) writes:
- >>
- >> I was told way back in my undergraduate days that one should generally
- >> "round to evens." Someone recently explained the rationale for this
- >> as follows. Suppose we start with 1.49 and round in the traditional
- >> manner twice. First we would round to 1.5 and then to 2. On the
- >> other hand, if we round just once we get 1. Rounding to evens
- >> prevents us from getting different answers.
-
- I missed the beginning of this thread, so pardon my asking a question
- that might have been answered already. Why is there a value in having
- two rounding operations producing the identical result as one
- (coarser?) rounding operation? Surely, since each application of
- ROUND loses some information, it is unreasonable to expect identical
- results?
-