round down to nearest number
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From:
noydb <jenn.du... @gmail.com> Date: Thu, 9 Feb 2012 16:30:53 -0800 (PST)
Local: Thurs, Feb 9 2012 7:30 pm
Subject: round down to nearest number
How do you round down ALWAYS to nearest 100? Like, if I have number
>>> round(3268, -2)
But, how to round DOWN?
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From:
Ian Kelly <ian.g.ke... @gmail.com> Date: Thu, 9 Feb 2012 17:47:09 -0700
Local: Thurs, Feb 9 2012 7:47 pm
Subject: Re: round down to nearest number
On Thu, Feb 9, 2012 at 5:30 PM, noydb <jenn.du
... @gmail.com> wrote:
> How do you round down ALWAYS to nearest 100? Like, if I have number
> 3268, I want that rounded down to 3200. I'm doing my rounding like
>>>> round(3268, -2)
> But, how to round DOWN?
>>> 3268 // 100 * 100
For more complicated cases, Decimal objects allow you to specify
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From:
noydb <jenn.du... @gmail.com> Date: Thu, 9 Feb 2012 17:23:46 -0800 (PST)
Local: Thurs, Feb 9 2012 8:23 pm
Subject: Re: round down to nearest number
hmmm, okay.
So how would you round UP always? Say the number is 3219, so you want
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From:
Chris Rebert <c... @rebertia.com> Date: Thu, 9 Feb 2012 17:43:58 -0800
Local: Thurs, Feb 9 2012 8:43 pm
Subject: Re: round down to nearest number
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From:
Ian Kelly <ian.g.ke... @gmail.com> Date: Thu, 9 Feb 2012 19:00:37 -0700
Local: Thurs, Feb 9 2012 9:00 pm
Subject: Re: round down to nearest number
On Thu, Feb 9, 2012 at 6:43 PM, Chris Rebert <c
... @rebertia.com> wrote:
> On Thu, Feb 9, 2012 at 5:23 PM, noydb <jenn.du
... @gmail.com> wrote:
>> hmmm, okay.
>> So how would you round UP always? Say the number is 3219, so you want
> http://stackoverflow.com/questions/17944/how-to-round-up-the-result-o...
> Thus: (3219 + 99) // 100
> Slight tangent: Beware negative numbers when using // or %.
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From:
noydb <jenn.du... @gmail.com> Date: Thu, 9 Feb 2012 18:25:56 -0800 (PST)
Local: Thurs, Feb 9 2012 9:25 pm
Subject: Re: round down to nearest number
That {>>> (3219 + 99) // 100} doesnt work if the number is other then
(for rounding up to nearest 100):
>>> (3219 + 99)//100
4
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From:
Terry Reedy <tjre... @udel.edu> Date: Thu, 09 Feb 2012 22:29:05 -0500
Local: Thurs, Feb 9 2012 10:29 pm
Subject: Re: round down to nearest number
On 2/9/2012 8:23 PM, noydb wrote:
> So how would you round UP always? Say the number is 3219, so you want
>>> (3333//100+1)*100
--
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From:
MRAB <pyt... @mrabarnett.plus.com> Date: Fri, 10 Feb 2012 03:36:11 +0000
Local: Thurs, Feb 9 2012 10:36 pm
Subject: Re: round down to nearest number
On 10/02/2012 02:25, noydb wrote:
> That {>>> (3219 + 99) // 100} doesnt work if the number is other then
> 4 digits.
> (for rounding up to nearest 100):
Those are all rounded up to the nearest 100 correctly.
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From:
MRAB <pyt... @mrabarnett.plus.com> Date: Fri, 10 Feb 2012 03:39:08 +0000
Local: Thurs, Feb 9 2012 10:39 pm
Subject: Re: round down to nearest number
On 10/02/2012 03:29, Terry Reedy wrote:
> On 2/9/2012 8:23 PM, noydb wrote:
Doing it that way doesn't always work. For example:
>>> (3400 // 100 + 1) * 100
However:
>>> (3400 + 99) // 100 * 100
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From:
Ian Kelly <ian.g.ke... @gmail.com> Date: Thu, 9 Feb 2012 23:21:31 -0700
Local: Fri, Feb 10 2012 1:21 am
Subject: Re: round down to nearest number
On Thu, Feb 9, 2012 at 8:36 PM, MRAB <pyt
... @mrabarnett.plus.com> wrote:
> On 10/02/2012 02:25, noydb wrote:
>> That {>>> (3219 + 99) // 100} doesnt work if the number is other then
>> (for rounding up to nearest 100):
>>>>> (3219 + 99)//100
>> 33
>>>>> (3289 + 99)//100
>> 33
>>>>> (328678 + 99)//100
>> 3287
>>>>> (328 + 99)//100
>> 4
>>>> (3219 + 99) // 100 * 100
> Those are all rounded up to the nearest 100 correctly.
>>> (3300.5 + 99) // 100 * 100
3300.0
A more consistent alternative is to negate the number, round down, and
>>> -(-(3300.5) // 100 * 100)
3400.0
Cheers,
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From:
Arnaud Delobelle <arno... @gmail.com> Date: Fri, 10 Feb 2012 09:58:35 +0000
Local: Fri, Feb 10 2012 4:58 am
Subject: Re: round down to nearest number
On 10 February 2012 06:21, Ian Kelly <ian.g.ke... @gmail.com> wrote:
>>>>> (3219 + 99) // 100 * 100
>> 3300
>>>>> (3289 + 99) // 100 * 100
>> 3300
>>>>> (328678 + 99) // 100 * 100
>> 328700
>>>>> (328 + 99) // 100 * 100
>> 400
>> Those are all rounded up to the nearest 100 correctly.
> One thing to be aware of though is that while the "round down" formula
>>>> (3300.5 + 99) // 100 * 100
>>> 212 - (212 % -100)
300
Here's a function that:
>>> def round(n, k):
... return n - n%k
>>> # Round down with a positive k:
... round(167, 100)
>>> round(-233, 100
... )
>>> # Round up with a negative k:
... round(167, -100)
>>> round(-233, -100)
... round(500, -100)
>>> round(500, 100)
... round(100.5, -100)
>>> round(199.5, 100)
100.0
--
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From:
Alec Taylor <alec.tayl... @gmail.com> Date: Fri, 10 Feb 2012 22:05:39 +1100
Local: Fri, Feb 10 2012 6:05 am
Subject: Re: round down to nearest number
o.O
Very nice
On Fri, Feb 10, 2012 at 8:58 PM, Arnaud Delobelle <arno
... @gmail.com> wrote:
> On 10 February 2012 06:21, Ian Kelly <ian.g.ke
... @gmail.com> wrote:
>>>>>> (3219 + 99) // 100 * 100
>>> 3300
>>>>>> (3289 + 99) // 100 * 100
>>> 3300
>>>>>> (328678 + 99) // 100 * 100
>>> 328700
>>>>>> (328 + 99) // 100 * 100
>>> 400
>>> Those are all rounded up to the nearest 100 correctly.
>> One thing to be aware of though is that while the "round down" formula
>>>>> (3300.5 + 99) // 100 * 100
> I'm surprised I haven't seen:
>>>> 212 - (212 % -100)
> Here's a function that:
>>>> def round(n, k):
> --
http://mail.python.org/mailman/listinfo/python-list
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From:
noydb <jenn.du... @gmail.com> Date: Fri, 10 Feb 2012 09:23:21 -0800 (PST)
Local: Fri, Feb 10 2012 12:23 pm
Subject: Re: round down to nearest number
On Feb 10, 4:58 am, Arnaud Delobelle <arno... @gmail.com> wrote:
> On 10 February 2012 06:21, Ian Kelly <ian.g.ke
... @gmail.com> wrote:
> >>>>> (3219 + 99) // 100 * 100
> >> Those are all rounded up to the nearest 100 correctly.
> > One thing to be aware of though is that while the "round down" formula
> >>>> (3300.5 + 99) // 100 * 100
> I'm surprised I haven't seen:
> >>> 212 - (212 % -100)
> 300
> Here's a function that:
> >>> def round(n, k):
> ... return n - n%k
> ... round(167, 100)
> ... )
> ... round(167, -100)
> ... round(500, -100)
> ... round(100.5, -100)
> 100.0
> --
> - Show quoted text -
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From:
Olive <di... @bigfoot.com> Date: Fri, 10 Feb 2012 21:56:44 +0100
Local: Fri, Feb 10 2012 3:56 pm
Subject: Re: round down to nearest number
On Thu, 9 Feb 2012 17:43:58 -0800
This trick work always (even if the entry is a float):
-(-a//100)*100
>>> -(-3219//100)*100
3300
>>> -(-3200.1//100)*100
3300.0
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From:
Hrvoje Niksic <hnik... @xemacs.org> Date: Sat, 11 Feb 2012 11:26:08 +0100
Local: Sat, Feb 11 2012 5:26 am
Subject: Re: round down to nearest number
Terry Reedy <tjre
... @udel.edu> writes:
> On 2/9/2012 8:23 PM, noydb wrote:
>> So how would you round UP always? Say the number is 3219, so you want
>>>> (3333//100+1)*100
> 3400
>>> (3300//100+1)*100
3400 # 3300 would be correct
I'd go with Chris Rebert's (x + 99) // 100.
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