Hi Tim,
Thanks for the response,
> You'll probably want to use an iterator instead. It should be much
> less memory-intensive. Additionally, ``xrange``s are especially
> optimized for iteration.
>
> database = CremonaDatabase().iter(xrange(1, 130001))
Yes, the code I wrote took a really long ti
Hi William,
Thank you for all the information. I have spent time this morning
going through it all, the alarm thing is really useful ~ I also
discovered Ctl-C, which seems to be quite handy! (I am REALLY new to
this! John had shown me, but I forgot.)
> * check out the @parallel decorator (not
Hi,
I've written with my supervisor some code that computes the isogeny
class of a curve over QQ. I would like to check it with the entire
Cremona database overnight, but I'm not sure how to do that!
To do it case by case I would do something like:
sage: isogs, matrix = E.isogeny_class()
sage:
Hi
I'm trying to write some code involving isogenies that will work over
different types of fields (at least rational and finite and hopefully
number fields too.) Part of the code includes the line:
fp.numerator()-j*fp.denominator() where fp is a polynomial in t over
Qt = FractionField(Polynomia
Problem resolved!
Cheers,
Jenny
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Hi,
Here is an example:
sage: Qt = Frac(PolynomialRing(QQ,'t'))
sage: t = Qt.gen()
sage: R = PolynomialRing(Qt,'X')
sage: X = R.gen()
sage: k2 = X^2 -732*X + 94752
sage: E = EllipticCurve('11a1')
sage: E.isogeny(kernel=k2, model = "minimal")
Result: horrible, horrible error!
Thanks,
Jenny
--
I am new to developing Sage, so sorry if I am missing something minor.
I am trying to use a polynomial in X as the kernel, with
R = PolynomialRing(Qt,'X')
X = R.gen()
The error I'm getting is:
TypeError: unsupported operand parent(s) for '+': 'Multivariate
Polynomial Ring in x, y over Rational F
I would like to apply the patches from ticket #6384 to the clone I'm
using. I have not done this before and I want to make sure that I
apply it to the clone and not the main. I'm not entirely sure how to
do this.
Also, this patch seems to rely upon another from ticket #6672, so do I
need to add t
