Hi Boost People, Have just a simple Question: 1. I use the uBLAS matrix class together with the MPI. Is it save to send matrices similar to std::vectors, by using &(Matrix(0, 0)) as the argument for the sending buffer? (Similar as one can do &(Vector[0]) for the std::vector? ) I just use matrix<double> in the code, without any further template specifications. Thanx P.