Introduce a zero-sized vector as a "universal zero" #120
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See the discussion in #118 for motivation.
Zero
from num-traits has not been implemented yetAlso left out was the multiplication of that vector to a matrix from the left. It is more involved, as the left vector is treated like a matrix. A possible solution would be to extend the universal zero concept to matrices.
For now, the above step seems out-of-scope for this PR.
EDIT: changed my mind to include the
Zero
trait impl.