push_back / append或在C ++ Armadillo中追加带循环的向量

I would like to create a vector (arma::uvec) of integers - I do not ex ante know the size of the vector. I could not find approptiate function in Armadillo documentation, but moreover I was not successfull with creating the vector by a loop. I think the issue is initializing the vector or in keeping track of its length.I would like to create a vector (arma::uvec) of