Is this intended to work over finite fields? From the documentation
* "base_ring" - the base ring. Defaults to QQ if no character is
given, or to the minimal extension of QQ containing the values
the character.
And there is no example with non zero characteristic fields.
On 02/07/16 23:42, Rob Harron wrote:
Hi,
I'm trying to do some computations with mod 3 modular forms and I'm running
into a couple of errors.
(1) An assertion error. For example,
sage: chi = kronecker_character(3*34603)
sage: M = ModularSymbols(chi, 2, sign=1, base_ring=GF(3))
...
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modular/modsym/relation_matrix.py",
line 126, in modS_relations
assert j != -1
AssertionError
This appears to be something about not finding a relation that should exist
between two symbols.
(2) An arithmetic error. For example,
sage: chi = kronecker_character(3*61379)
sage: M = ModularSymbols(chi, 2, sign=1, base_ring=GF(3))
...
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modular/modsym/relation_matrix.py",
line 125, in modS_relations
j, s = syms.apply_S(i)
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modular/modsym/manin_symbol_list.py",
line 1062, in apply_S
k, s = self.index((self._weight-2-i, v, -u))
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modular/modsym/manin_symbol_list.py",
line 1255, in index
x, s = self.normalize(x)
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modular/modsym/manin_symbol_list.py",
line 1290, in normalize
u,v,s = self.__P1.normalize_with_scalar(x[1],x[2])
File "sage/modular/modsym/p1list.pyx", line 1160, in
sage.modular.modsym.p1list.P1List.normalize_with_scalar
(/projects/sage/sage-6.10/src/build/cythonized/sage/modular/modsym/p1list.c:8566)
self.__normalize(self.__N, u, v, &uu, &vv, &ss, 1)
File "sage/modular/modsym/p1list.pyx", line 363, in
sage.modular.modsym.p1list.c_p1_normalize_llong
(/projects/sage/sage-6.10/src/build/cythonized/sage/modular/modsym/p1list.c:2997)
ss[0] = <int> (arith_llong.c_inverse_mod_longlong(s*min_t, N) % ll_N)
File "sage/rings/fast_arith.pyx", line 381, in
sage.rings.fast_arith.arith_llong.c_inverse_mod_longlong
(/projects/sage/sage-6.10/src/build/cythonized/sage/rings/fast_arith.c:5546)
raise ArithmeticError("The inverse of %s modulo %s is not
defined."%(a,m))
ArithmeticError: The inverse of -2142142713 modulo 184137 is not defined.
Does anyone know what might be causing this or if there's a workaround?
Thanks.
Best,
Rob
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