[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

2009-12-17 Thread Marcos Donolo 

New submission from Marcos Donolo :

I am not getting the expected result for the ** operator on windows,
python 2.6
I do...
a=float('nan')
b=a*a
then b is nan which is right but if I do 
b = a**2 I get.
Traceback (most recent call last):
  File "", line 1, in 
ValueError: (33, 'Domain error')

If I do a**2 on ubuntu, python 2.6 I get nan again.

--
components: Interpreter Core
messages: 96523
nosy: mdon...@vt.edu, tim_one
severity: normal
status: open
title: float('nan')**2 != nan.  float('nan')**2 error 33 on windows
type: behavior
versions: Python 2.6

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[issue7536] float('inf')**2 != inf

2009-12-17 Thread Marcos Donolo 

New submission from Marcos Donolo :

The ** operator produces an error when it gets inf as an argument.
if I try.
>>>a=float('inf')
>>>a*a 
inf
-but if I try 
>>>a**2 
Traceback (most recent call last):
  File "", line 1, in 
OverflowError: (34, 'Result too large')
I should get inf too.

--
components: Interpreter Core
messages: 96527
nosy: mdonolo, tim_one
severity: normal
status: open
title: float('inf')**2 != inf
type: behavior
versions: Python 2.6

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[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

2009-12-17 Thread Marcos Donolo 

Marcos Donolo  added the comment:

I will give it a shot.

On Thu, Dec 17, 2009 at 11:22 AM, Mark Dickinson wrote:

>
> Mark Dickinson  added the comment:
>
> Yep.  There's not much consistency in inf/nan handling across platforms,
> though the situation is slowly getting better.  math.pow makes an effort
> to handle these special cases correctly (for some value of correctly), and
> it would probably make some sense to have the builtin pow behave the same
> way.
>
> Would you be interested in contributing a fix?
>
> --
> stage:  -> needs patch
>
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title: float('nan')**2 != nan.  float('inf')**2 != inf.  float('nan')**2 error 
33 on windows -> float('nan')**2 != nan. float('nan')**2 error 33 on windows
Added file: http://bugs.python.org/file15584/unnamed

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___I will give it a shot.On Thu, Dec 17, 2009 at 
11:22 AM, Mark Dickinson <mailto:rep...@bugs.python.org";>rep...@bugs.python.org> 
wrote:

Mark Dickinson <mailto:dicki...@gmail.com";>dicki...@gmail.com> added the 
comment:

Yep.  There's not much consistency in inf/nan handling across 
platforms,
though the situation is slowly getting better.  math.pow makes an effort
to handle these special cases correctly (for some value of correctly), and
it would probably make some sense to have the builtin pow behave the same
way.

Would you be interested in contributing a fix?

--
stage:  -> needs patch

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[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

2009-12-18 Thread Marcos Donolo 

Marcos Donolo  added the comment:

Ok, I have patch ready. how do we go about putting it in?
thanks.
marcos

On Thu, Dec 17, 2009 at 11:52 AM, Ezio Melotti wrote:

>
> Changes by Ezio Melotti :
>
>
> --
> nosy: +ezio.melotti
> versions: +Python 3.1
>
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Added file: http://bugs.python.org/file15595/unnamed

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___Ok, I have patch ready. how do we go about putting it 
in?thanks.marcosOn Thu, Dec 17, 2009 
at 11:52 AM, Ezio Melotti <mailto:rep...@bugs.python.org";>rep...@bugs.python.org> 
wrote:

Changes by Ezio Melotti <mailto:ezio.melo...@gmail.com";>ezio.melo...@gmail.com>:


--
nosy: +ezio.melotti
versions: +Python 3.1

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[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

2009-12-18 Thread Marcos Donolo 

Changes by Marcos Donolo :


Added file: http://bugs.python.org/file15597/floatobject.c

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[issue7534] float('nan')**2 != nan. float('nan')**2 error 33 on windows

2009-12-18 Thread Marcos Donolo 

Marcos Donolo  added the comment:

I had to handle nans and infs in different places.

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