Need help w/ computing sums

Richard James Panturis Giuly <[email protected]>
Newsgroups gmane.lisp.matlisp.user
Message-ID <[email protected]> 
Is there a good way to compute the following for a large matrix?

(v's are column vectors of V, u's are vectors of U)

I need the value of each line; I'm sort of dragging one matrix over
the other (horizontally) and adding the elements of the parts that
touch.

[v3] + [u1]

[v2 v3] + [u1 u2]

[v1 v2 v3] + [u1 u2 u3]

[v1 v2] + [u2 u3]

[v1] + [u3]
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