I just tried the following code on sagemath cloud. Note the last line in
the error message -- clearly not correct!
Victor
sage> V = VectorSpace(QQ,12)
sage> C = ModulesWithBasis(V.base_ring())
sage> C0 = C.FiniteDimensional()
sage> V in C0
False
sage> v = V.random_element()
sage> V0 = V.subspace([v])
sage> V0 in C0
False
sage> def DualMorphism(S):
sage> A = matrix(S.gens())
sage> V = S.ambient_vector_space()
sage> return V.module_morphism(matrix=A)
sage> foo = DualMorphism(V0)
Error in lines 1-1
Traceback (most recent call last):
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/smc_sagews/sage_server.py",
line 947, in execute
exec compile(block+'\n', '', 'single') in namespace, locals
File "", line 1, in <module>
File "", line 4, in DualMorphism
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/categories/modules_with_basis.py",
line 541, in module_morphism
return ModuleMorphismFromMatrix(domain=self, matrix=matrix, **keywords)
File "sage/misc/lazy_import.pyx", line 379, in
sage.misc.lazy_import.LazyImport.__call__
(/projects/sage/sage-6.10/src/build/cythonized/sage/misc/lazy_import.c:3560)
return self._get_object()(*args, **kwds)
File
"/projects/sage/sage-6.10/local/lib/python2.7/site-packages/sage/modules/with_basis/morphism.py",
line 1270, in __init__
raise ValueError("The domain %s should be finite dimensional"%domain)
ValueError: The domain Vector space of dimension 12 over Rational Field
should be finite dimensional
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