That should be possible, but you will have to copy the data from the std::vector to the ublas::vector. The syntax you used in the first post would suggest that you want to use a std::vector as the underlying storage of a ublas::vector. As far as my experience goes you can use any of the standard algorithms on ublas vectors just as you would with std::vector which would allow them to be used almost interchangeably in most situations (except for dynamic size changing supported by the std::vector).

something like this perhaps:

std::vector<double> svd(3,1.0);

ublas::vector<double> uvd(svd.size());
std::copy(svd.begin(), svd.end(), uvd.begin());