Pari stack overflow #9
Description
Once the Pari stack overflows, subsequent sage commands which use the Pari library do not work.
Ifti.
burhanud@sage:~$ sage
--------------------------------------------------------
| SAGE Version 1.3.7.1, Build Date: 2006-09-10-2157 |
| Distributed under the GNU General Public License V2. |
--------------------------------------------------------
sage: E = EllipticCurve([0,0,0,-307*1907,0])
sage: E.Lseries_deriv_at1()
---------------------------------------------------------------------------
exceptions.RuntimeError Traceback (most
recent call last)
/home/burhanud/<ipython console>
/home/was/sage/local/lib/python2.4/site-packages/sage/schemes/elliptic_curves/ell_rational_field.py
in Lseries_deriv_at1(self, k)
1724 # Compute z = e^(-2pi/sqrt(N))
1725 pi = 3.14159265358979323846
-> 1726 v = transcendental.exponential_integral_1(2*pi/sqrtN, k)
1727 L = 2*float(sum([ (v[n-1] * an[n])/n for n in
xrange(1,k+1)]))
1728 error = 2*exp(-2*pi*(k+1)/sqrtN)/(1-exp(-2*pi/sqrtN))
/home/was/sage/local/lib/python2.4/site-packages/sage/functions/transcendental.py
in exponential_integral_1(x, n)
83 return float(pari(x).eint1())
84 else:
---> 85 return [float(z) for z in pari(x).eint1(n)]
86
87 def gamma(s):
/home/burhanud/gen.pyx in gen._pari_trap()
RuntimeError: The PARI stack overflowed. Use pari.allocatemem() to double
the stack.
sage: factor(4)
---------------------------------------------------------------------------
exceptions.RuntimeError Traceback (most
recent call last)
/home/burhanud/<ipython console>
/home/was/sage/local/lib/python2.4/site-packages/sage/rings/arith.py in
factor(n, proof, int_, algorithm, verbose)
1244 if algorithm == 'pari':
1245 return factorization.Factorization(__factor_using_pari(n,
-> 1246 int_=int_,
debug_level=verbose), unit)
1247 elif algorithm == 'kash':
1248 F = kash.eval('Factorization(%s)'%n)
/home/was/sage/local/lib/python2.4/site-packages/sage/rings/arith.py in
__factor_using_pari(n, int_, debug_level)
1168 import sage.rings.integer_ring
1169 Z = sage.rings.integer_ring.IntegerRing()
-> 1170 prev = pari.get_debug_level()
1171 pari.set_debug_level(debug_level)
1172 F = pari(n).factor()
/home/burhanud/gen.pyx in gen.PariInstance.get_debug_level()
/home/burhanud/gen.pyx in gen.PariInstance.default()
/home/burhanud/gen.pyx in gen._pari_trap()
RuntimeError: The PARI stack overflowed. Use pari.allocatemem() to double
the stack.
sage: factor(4, algorithm='kash')
2^2
Component: basic arithmetic
Issue created by migration from https://trac.sagemath.org/ticket/9