Hello,
I suspect there is a bug in the implementation of the vector function.
It seems that when trying to construct a sparse vector by a dictionary
sage simply ignores the keys. for example:
sage: v = vector({3:1.1 , 5:3.14}); v
(1.10000000000000, 3.14000000000000)
where one would expect the behavior to be similar to matrix:
sage: m = matrix({(0,3):1.1 , (0,5):3.14}); m
[0.000000000000000 0.000000000000000 0.000000000000000
1.10000000000000 0.000000000000000 3.14000000000000]
it seems to me that the problem is in prepare_dict (in
free_module_element)
Thanks,
Shay
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