Re: [sage-support] Quotient of two submodules

[William Stein]

On Sat, Jun 19, 2010 at 8:04 AM, Johannes <dajo...@web.de> wrote:
> I'm working with the version, contained in ubuntu 10.04

Delete that and get a recent version from http://sagemath.org/. The
Ubuntu/Debian
version is ancient (well over 2 years old), and nobody working on Sage knows how
to update it or get it removed from Ubuntu.

William

>
> j_schn14@neo:~$ sage -version
> | SAGE Version 3.0.5, Release Date: 2008-07-11                       |
> j_schn14@neo:~$ uname  -a
> Linux neo 2.6.31-22-generic #60-Ubuntu SMP Thu May 27 00:22:23 UTC 2010
> i686 GNU/Linux
> j_schn14@neo:~$ python --version
> Python 2.6.4
>
> greatz
>
> Am 19.06.2010 16:51, schrieb William Stein:
>> On Sat, Jun 19, 2010 at 7:33 AM, Johannes <dajo...@web.de> wrote:
>>
>>> i tried the first example in the given link and i get the following error:
>>>
>>> sage: V0 = span([[1/2,0,0],[3/2,2,1],[0,0,1]],ZZ)
>>> ---------------------------------------------------------------------------
>>> TypeError                                 Traceback (most recent call last)
>>>
>>> /home/j_schn14/<ipython console> in <module>()
>>>
>>> /usr/lib/python2.5/site-packages/sage/modules/free_module.pyc in span(R,
>>> gens, check, already_echelonized)
>>>    349         [1 0 1]
>>>    350     """
>>> --> 351     if len(gens) == 0:
>>>    352         return FreeModule(R, 0)
>>>    353     else:
>>>
>>> /usr/lib/python2.5/site-packages/sage/rings/integer_ring.so in
>>> sage.rings.integer_ring.IntegerRing_class.__len__
>>> (sage/rings/integer_ring.c:3903)()
>>>
>>> TypeError: len() of unsized object
>>>
>>> is this a bug, or am I doing something wrong?
>>> greatz Mad
>>>
>> What version of Sage are you using?  It works fine in recent versions:
>>
>> flat:Library wstein$ sage
>> ----------------------------------------------------------------------
>> | Sage Version 4.4.2, Release Date: 2010-05-19                       |
>> | Type notebook() for the GUI, and license() for information.        |
>> ----------------------------------------------------------------------
>> sage: V0 = span([[1/2,0,0],[3/2,2,1],[0,0,1]],ZZ)
>> sage:
>> sage: V0
>> Free module of degree 3 and rank 3 over Integer Ring
>> Echelon basis matrix:
>> [1/2   0   0]
>> [  0   2   0]
>> [  0   0   1]
>>
>
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>

--
William Stein
Professor of Mathematics
University of Washington
http://wstein.org

[Johan Grönqvist]

2010-06-19 17:15, William Stein skrev:

> On Sat, Jun 19, 2010 at 8:04 AM, Johannes wrote:
>
>> I'm working with the version, contained in ubuntu 10.04
>>

> The
> Ubuntu/Debian
> version is ancient (well over 2 years old), and nobody working on Sage knows how
> to update it or get it removed from Ubuntu.
>
>

I thought sage was removed from ubuntu as of 10.04, as indicated by a
search on their webpage [0].
To me it clearly suggests that sage was part of jaunty and karmic
(ubuntu 9.04 and 9.10), but is no longer "contained in ubuntu" as of 10.04.

My ubuntu installation (netbook edition, 10.04) also claims that the
sagemath package is no longer available from the official repositories.

[0]:
<http://packages.ubuntu.com/search?keywords=sagemath&searchon=names&suite=all&section=all>

Regards

Johan