Hi, Doing a cvs update of the Boost CVS I encountered a compiler bug in ublas: ...boost/boost/numeric/ublas/matrix_sparse.hpp:2556: error: no matching function for call to `boost::numeric::ublas::unbounded_array<size_t, std::allocator<size_t> >::unbounded_array() Is there a problem in the constructor of matrix_sparse, or is the missing default constructor of unbounded_array the problem? Could one of the ublas developers look into this problem? Matthias