Either I completely misunderstand something, or zero_vector is seriously broken:
int main() {
ublas::zero_vector<double> zeros (10);
copy (zeros.begin(), zeros.end(), ostream_iterator<double> (cout, " "));
}
I expect this to print 10 '0'. Instead, it prints nothing.
That's probably because begin() and end() return an *indexed iterator* which might skip zeros.
A normal ("dense") vector behaves the way you want it to -- but in general I wouldn't count in it. You better check the indexed iterator concept again.
Cheers!
SG