Would it be easy to make a set_immutable function for vectors? Grepping
through the matrix code for the parts dealing with mutability makes it
seem like it would be a huge project to add it to vectors, but I don't know.
I'd like to use vectors for vertices in a graph, which requires that
they be hashable. For reference, I now do:
sage: v = vector(GF(2),[1,0])
sage: w = vector(GF(2),[0,1])
sage: g = Graph({tuple(v): tuple(w)})
To reconstruct the vector from the tuple t, it seems like it is enough
to call vector(t) (it even guesses the right field from the elements!),
i.e., it seems that v==vector(tuple(v)) for a vector. Can I count on
v==vector(tuple(v)) being True?
Thanks,
Jason
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