Hi, I've noticed that resize() with data preservation is not implemented for sparse matrices (matrix_sparse.hpp:2791). Does anyone have any suggestions on how to get around that? Many thanks, Ernest Run-time error: Check failed in file /opt/local/include/boost/numeric/ublas/ matrix_sparse.hpp at line 2791: !preserve terminate called after throwing an instance of 'boost::numeric::ublas::internal_logic' what(): internal logic Abort trap