But Python 3 switched to round-to-even, FWIW.
At Mon, 18 Mar 2013 06:49:28 -0500, Robby Findler wrote:
> FWIW: it appears that both ruby and python round n.5 to n+1.
>
> Robby
>
>
> On Sun, Mar 17, 2013 at 11:00 PM, Neil Toronto wrote:
>
> > On 03/16/2013 08:47 PM, Eric Nadeau wrote:
> >
> >>
FWIW: it appears that both ruby and python round n.5 to n+1.
Robby
On Sun, Mar 17, 2013 at 11:00 PM, Neil Toronto wrote:
> On 03/16/2013 08:47 PM, Eric Nadeau wrote:
>
>> I'm ditching Scheme altogether based on this...
>>
>
> In case you're not trolling: changing languages won't help. This is
>
On 03/16/2013 08:47 PM, Eric Nadeau wrote:
I'm ditching Scheme altogether based on this...
In case you're not trolling: changing languages won't help. This is
standard behavior. And for goodness sake, you can always write your own
function!
Neil ⊥
Racket Users list:
On Mar 16, 2013, at 11:47 PM, Eric Nadeau wrote:
> The point of rounding is coming up with the best possible integer
> approximation for a decimal and this nearest even number rule does not
> qualify.
Why not? In these cases there is no "the" best possible integer approximation,
but two equ
> The point of rounding is coming up with the best possible integer
> approximation for a decimal and this nearest even number rule does not
> qualify. This "logic" was used by my grandparents' generation because odd
> numbers were seen as less pure than even ones.
This is a strawman argument.
Racket is not Scheme. Please do not let our decisions influence your
opinion of other languages. Go try Scheme for real.
Robby
On Sat, Mar 16, 2013 at 10:47 PM, Eric Nadeau wrote:
>
> The point of rounding is coming up with the best possible integer
> approximation for a decimal and this near
The point of rounding is coming up with the best possible integer approximation
for a decimal and this nearest even number rule does not qualify. This "logic"
was used by my grandparents' generation because odd numbers were seen as less
pure than even ones.
I'm ditching Scheme altogether based
On 03/16/2013 05:33 PM, Danny Yoo wrote:
Since when is round 0.5 not giving 1?!
According to the documentation:
http://docs.racket-lang.org/reference/generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._round%29%29
"Returns the integer closest to x, resolving ties in favor o
40 minutes ago, Carl Eastlund wrote:
> That's an overly specific solution. I believe the more general rounding
> function taught in grade-school math would be:
>
> (define (my-round n)
> (floor (+ n 1/2)))
If you want 0.5 to round down to 0, then
(define (my-round n) (ceiling (- n 1/2)))
-
On Sat, Mar 16, 2013 at 10:21:57AM -0400, Eric Nadeau wrote:
> Since when is round 0.5 not giving 1?!
I believe that this is standard in physics and engineering in order to avoid
statistical bias. For example, see the NIST "Guide for the Use of the
International System of Units", section B.7.
(
That's an overly specific solution. I believe the more general rounding
function taught in grade-school math would be:
(define (my-round n)
(floor (+ n 1/2)))
This is also untested. And it might need tweaking for negative numbers if
they are supposed to round away from zero, I forget how that
>
> Since when is round 0.5 not giving 1?!
According to the documentation:
http://docs.racket-lang.org/reference/generic-numbers.html#%28def._%28%28quote._~23~25kernel%29._round%29%29
"Returns the integer closest to x, resolving ties in favor of an
even number... "
And zero is an even
The docs say that it is round to even, which is the standard for
floating point numbers [1]. You can write your own rounding operator
that rounds .5 up if need be.
;; Untested
(define (my-round n)
(let ((r (round n))) (if (= .5 (- n r)) (add1 r) r)))
[1] http://en.wikipedia.org/wiki/Rounding#Ro
> Since when is round 0.5 not giving 1?!
http://en.wikipedia.org/wiki/Rounding#Round_half_to_even
--- nadeem
Racket Users list:
http://lists.racket-lang.org/users
Hi,
I was having problems with a mathematical application I'm writing and narrowed
it down to:
(round 0.5)
(round (/ 1 2))
(round 1.5)
(round (/ 3 2))
giving me
0.0
0
2.0
2
Since when is round 0.5 not giving 1?!
Cheers,
Eric
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