boost::shared_ptr<AugmentMatrix> AugmentManager::getMatrix(std::string name) {
    boost::shared_ptr<AugmentMatrix> matrix;
    if (_matrixMap.count(name) == 0) {
        matrix.reset(new AugmentMatrix());
        _matrixMap[name] = matrix;
    }
    else {
        matrix = _matrixMap[name];
    }
    return matrix;
}