ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Tue, 18 Jul 2017 09:31:37 -0500ContinuedFractions fail on large integers?http://ask.sagemath.org/question/38309/continuedfractions-fail-on-large-integers/ I've been doing some work with continued fractions, and when I get to a large enough number, I start hitting an error. For example, with the ContinuedFraction from [(18806263158919164762262694978536817267490601162205305175017345804331141023863425152608922362862834892943764814900901973487239748665085369033027389281788183,), [1, 1, 1, 1, 37612526317838329524525389957073634534981202324410610350034691608662282047726850305217844725725669785887529629801803946974479497330170738066054778563576366]]), I get the error below.
Specifically, I get it after I've created a ContinuedFraction with the arguments above, and then call .value() on it. I've tried to make sure all of those are sage Integer types, but it doesn't seem to help, and it looks like internally the CF code is overflowing somewhere. Is there any way around this, or is this a limitation I'll have to live with?
Thanks for any help!
Traceback (most recent call last):
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/multiprocessing/process.py", line 258, in _bootstrap
self.run()
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/multiprocessing/process.py", line 114, in run
self._target(*self._args, **self._kwargs)
File "/home/tc/code/cfp/pi/piX/ones.py", line 16, in leeloo
v = ocf.value()
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/site-packages/sage/rings/continued_fraction.py", line 1423, in value
Q = QuadraticField(DD, 'sqrt%d' % DD)
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py", line 922, in QuadraticField
return NumberField(f, name, check=False, embedding=embedding, latex_name=latex_name, **args)
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py", line 524, in NumberField
return NumberField_version2(polynomial=polynomial, name=name, check=check, embedding=embedding, latex_name=latex_name, assume_disc_small=assume_disc_small, maximize_at_primes=maximize_at_primes, structure=structure)
File "sage/structure/factory.pyx", line 362, in sage.structure.factory.UniqueFactory.__call__ (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/structure/factory.c:1856)
File "/home/tc/Downloads/sagetemp/SageMath/local/lib/python2.7/site-packages/sage/rings/number_field/number_field.py", line 612, in create_key_and_extra_args
x = number_field_morphisms.root_from_approx(polynomial, embedding)
File "sage/rings/number_field/number_field_morphisms.pyx", line 490, in sage.rings.number_field.number_field_morphisms.root_from_approx (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/number_field/number_field_morphisms.c:7640)
File "sage/rings/real_lazy.pyx", line 1584, in sage.rings.real_lazy.LazyAlgebraic.__init__ (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/real_lazy.c:17914)
File "sage/rings/polynomial/polynomial_element.pyx", line 7247, in sage.rings.polynomial.polynomial_element.Polynomial.roots (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/polynomial/polynomial_element.c:68115)
File "sage/rings/polynomial/polynomial_element.pyx", line 7143, in sage.rings.polynomial.polynomial_element.Polynomial.roots (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/polynomial/polynomial_element.c:64632)
File "sage/rings/polynomial/polynomial_element.pyx", line 5786, in sage.rings.polynomial.polynomial_element.Polynomial._pari_ (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/polynomial/polynomial_element.c:55229)
File "sage/rings/polynomial/polynomial_element.pyx", line 5839, in sage.rings.polynomial.polynomial_element.Polynomial._pari_with_name (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/polynomial/polynomial_element.c:55757)
File "sage/rings/real_mpfr.pyx", line 3103, in sage.rings.real_mpfr.RealNumber._pari_ (/home/tc/Downloads/sagetemp/SageMath/src/build/cythonized/sage/rings/real_mpfr.c:22771)
ValueError: Cannot convert NaN or infinity to Pari floatcappalloTue, 18 Jul 2017 09:31:37 -0500http://ask.sagemath.org/question/38309/Does QuadraticField use any special algorithms for computing the class group of quadratic imaginary number fields?http://ask.sagemath.org/question/26922/does-quadraticfield-use-any-special-algorithms-for-computing-the-class-group-of-quadratic-imaginary-number-fields/ I need to compute the class group of a quadratic imaginary number field that has a fairly large discriminant (over 96 bits.) I was wondering what, if any, algorithms the QuadraticField class uses for computing the class group.
Dan ShumowFri, 22 May 2015 15:23:45 -0500http://ask.sagemath.org/question/26922/How do I deal with large, hex numbers in Sage?http://ask.sagemath.org/question/26061/how-do-i-deal-with-large-hex-numbers-in-sage/ How do I deal with large, hex numbers in Sage (say ones with 256 or 512 bytes)? How would I import them from a CSV file?
(cf. [this related answer](http://ask.sagemath.org/question/24708/how-to-enter-very-large-numbers/?answer=24710#post-id-24710))GeremiaSat, 07 Mar 2015 10:47:47 -0600http://ask.sagemath.org/question/26061/How to enter very large numbershttp://ask.sagemath.org/question/24708/how-to-enter-very-large-numbers/ Hi,
What is the best way to enter very large integers ( more than a thousand integers) on sage online? I tried to split the number into multiple lines using continuation symbols like \ and ... but nothing works. The horizontal scroll bar is not showing up when i enter the number on a single line. Thanks for your help.
anonmoziThu, 30 Oct 2014 09:42:42 -0500http://ask.sagemath.org/question/24708/