Hi,
Given a PolynomialSequence, I want to compute its Groebner basis using
magma implementation of F4 algorithm. However, when I want to call
SetNthreads() in magma to use multiple threads during F4 algorithm, SAGE
throws the following error :
sage: magma.SetNthreads(4)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-1-2d29c32308b3> in <module>()
----> 1 magma.SetNthreads(Integer(4))
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in __call__(self, *args, **kwds)
1801 list(args),
1802 params=kwds,
-> 1803 nvals=nvals)
1804
1805 def _sage_doc_(self):
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in function_call(self, function, args, params, nvals)
1159 fun = "%s(%s%s)" % (function, ",".join([s.name() for s in
args]), par)
1160
-> 1161 return self._do_call(fun, nvals)
1162
1163 def _do_call(self, code, nvals):
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in _do_call(self, code, nvals)
1209 ans = None
1210 elif nvals == 1:
-> 1211 return self(code)
1212 else:
1213 v = [self._next_var_name() for _ in range(nvals)]
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in __call__(self, x, gens)
789 pass
790
--> 791 A = Expect.__call__(self, x)
792 if has_cache:
793 x._magma_cache[self] = A
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc
in __call__(self, x, name)
242
243 if isinstance(x, six.string_types):
--> 244 return cls(self, x, name=name)
245 try:
246 return self._coerce_from_special_method(x)
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
in __init__(self, parent, value, is_name, name)
1380 except (RuntimeError, ValueError) as x:
1381 self._session_number = -1
-> 1382 raise_(TypeError, x, sys.exc_info()[2])
1383 except BaseException:
1384 self._session_number = -1
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
in __init__(self, parent, value, is_name, name)
1375 else:
1376 try:
-> 1377 self._name = parent._create(value, name=name)
1378 # Convert ValueError and RuntimeError to TypeError for
1379 # coercion to work properly.
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc
in _create(self, value, name)
432 def _create(self, value, name=None):
433 name = self._next_var_name() if name is None else name
--> 434 self.set(name, value)
435 return name
436
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in set(self, var, value)
624 13/5
625 """
--> 626 out = self.eval("%s:=%s" % (var, value))
627 if out.lower().find("error") != -1:
628 raise TypeError("Error executing Magma code:\n%s" % out)
/home/makarimrh/sage-forked/local/lib/python2.7/site-packages/sage/interfaces/magma.pyc
in eval(self, x, strip, **kwds)
558 ans = Expect.eval(self, x, **kwds).replace('\\\n', '')
559 if 'Runtime error' in ans or 'User error' in ans:
--> 560 raise RuntimeError("Error evaluating Magma
code.\nIN:%s\nOUT:%s" % (x, ans))
561 return ans
562
TypeError: Error evaluating Magma code.
IN:_sage_[2]:=SetNthreads(_sage_[1]);
OUT:
>> _sage_[2]:=SetNthreads(_sage_[1]);
^
Runtime error in 'SetNthreads': Bad argument types (possibly calling
function signature of intrinsic as a procedure)
Argument types given: RngIntElt
I use Magma 2.20-6 and Sage 7.3. Is this considered a bug ?
--
Rusydi H. Makarim
PhD Student
Mathematisch Instituut <http://www.math.leidenuniv.nl/>, Universiteit Leiden
<http://www.leiden.edu/> and
Cryptology Group <https://projects.cwi.nl/crypto/index.php>, Centrum
Wiskunde & Informatica (CWI) <https://www.cwi.nl/>
Amsterdam, the Netherlands
Email : maka...@cwi.nl, r.h.maka...@math.leidenuniv.nl
Web : http://pub.math.leidenuniv.nl/~makarimrh/
<http://pub.math.leidenuniv.nl/~makarimrh/index.html>
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