On Wed, Jun 2, 2010 at 10:33 AM, Mike Hansen <mhan...@gmail.com> wrote:
> On Wed, Jun 2, 2010 at 6:43 AM, kcrisman <kcris...@gmail.com> wrote:
>> I guess I'm a little surprised that even the 'vector' explicitly
>> designated to be over ZZ isn't in there.  I think I'm mathematically
>> ok, too - taking the echelon matrix, isn't my vector e_1-(1/3)*e_2-
>> (1/3)*e_3 ?
>
> Those coefficients are in QQ not ZZ.

Try:

M = matrix(QQ, [[1,1,1,1,1,1],[1,1,-2,1,1,-2],[-2,1,1,-2,1,1],[1,-2,1,1,-2,1]])

or

M = matrix([[1/1,1,1,1,1,1],[1,1,-2,1,1,-2],[-2,1,1,-2,1,1], [1,-2,1,1,-2,1]])

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

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