On Mar 1, 12:59 pm, Robert Goss wrote:
> > What kind of generators of ideals are you dealing with?
>
> For reference all the input generators are in QQ.
>
> Robert
Then, definitely you should work in PolynomialRing(QQ,2)
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> What kind of generators of ideals are you dealing with?
For reference all the input generators are in QQ.
Robert
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> No, it is not an exact computation over the complex, they are gauss
> rationals a+b*I where a and b are rationals. As far as I know there is
> no exact complex field implementation that is good for working with
> ideals.
Ah yes that would make a lot of sense.
I will go back to my problem and se
No, it is not an exact computation over the complex, they are gauss
rationals a+b*I where a and b are rationals. As far as I know there is
no exact complex field implementation that is good for working with
ideals.
What kind of generators of ideals are you dealing with?
Note that even if the inpu
Thank you very much for your advice. I was trying to work out if the
problem lay with me sage or documentation.
> Do not use ideals over CC. CC is an inexact ring, so most operations
> will fail. Work instead over the rationals.
>
> R. = PolynomialRing(QQ,2)
>
> or if you need complex numbers, you
Robert,
You have been answered how to solve the problem. But I would like to
remark Volker's advice.
Do not use ideals over CC. CC is an inexact ring, so most operations
will fail. Work instead over the rationals.
R. = PolynomialRing(QQ,2)
or if you need complex numbers, you may try with a numb
On Tuesday 01 March 2011, Simon King wrote:
> Hi Robert,
>
> On 1 Mrz., 01:00, Robert Goss wrote:
> > I have 2 ideals over the complex field and I would like to take their
> > intersection. If I try and use the intersection method on one of the
> > ideals i get an error message from singular stat
Hi Robert,
On 1 Mrz., 01:00, Robert Goss wrote:
> I have 2 ideals over the complex field and I would like to take their
> intersection. If I try and use the intersection method on one of the
> ideals i get an error message from singular stating the following type
> error:
>
> TypeError: Cannot ca
Singular supports working with floating-point complex numbers (CDF in Sage),
so it should work.
Having said that, floating-point computations with polynomials are often
dangerous because of the limited precision. Its usually better to work with
arbitrary-precision coefficients like QQ or cyclo
