Hi everyone.
The following code raises a KeyError on the last line (say, in SageMathCell
<https://sagecell.sagemath.org/>):
X = SimplicialComplex ([[0], [1]])
print (X.faces (SimplicialComplex ()))
X.add_face ([0, 1])
{0: set([(0,), (1,)]), -1: set([])}
---------------------------------------------------------------------------KeyError
Traceback (most recent call
last)<ipython-input-1-aeef18038aa4> in <module>() 1 X = SimplicialComplex
([[Integer(0)], [Integer(1)]]) 2 print (X.faces (SimplicialComplex
()))----> 3 X.add_face ([Integer(0), Integer(1)])
/home/sc_serv/sage/local/lib/python2.7/site-packages/sage/homology/simplicial_complex.pyc
in add_face(self, face) 2552 new_faces =
all_new_faces[dim] 2553 else:-> 2554
new_faces = all_new_faces[dim].difference(L.faces()[dim]) 2555
L_complex[dim] = L_complex[dim].union(new_faces) 2556
else:
KeyError: 0
If one removes "SimplicialComplex ()" from the middle line, everything
works neatly. Well, that's it.
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