[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Date: Thu, 27 Jun 91 17:21 PDT
From: rsl@MAX-FLEISCHER.SF.Dialnet.ILA.COM (Richard Lamson)
Date: Thu, 27 Jun 1991 11:44-0400
From: JGA@alderaan.scrc.symbolics.com (John G. Aspinall)
Date: Thu, 27 Jun 1991 05:29 EDT
From: kddlab!atr-la.atr.co.jp!myers@uunet.UU.NET (John K. Myers)
What is the rationale for having ROUND round to the nearest
even integer on a .5 boundary, instead of rounding down in every case?
Does it make it easier to implement? Not rounding down
creates beat frequencies in my numeric representations.
I'd vote for having the standard changed next time.
Unless, is there a graphics application or something that likes
having ROUND wobble?
The behaviour of ROUND is determined by the IEEE standard on
floating-point operations. The rationale behind the standard is, in
turn, that rounding should be unbiased in a statistical sense.
Also, if you genuinely want to round down in all cases, you can always
(FLOOR (+ X 0.5)) ; Or (+ x 0.5d0) or (+ X 1/2), as appropriate.
That's round up. Round down is (CEILING (- X 0.5)) .
You may want to send a correction.
(TRUNCATE (+ X 0.5))
- From: rsl@MAX-FLEISCHER.SF.Dialnet.ILA.COM (Richard Lamson)