How to initialize 3 dimension vector with the size in C++

Question

For example, if we initialize vector<vector<vector<double>>> f, the dimension in each direction is not specified. So, I am wondering, what command should we insert to make f have size of [3][4][5]. Do we use new or something else?

Thanks for helping me out!

Answer 1

vector<vector<vector<double>>> f(3, vector<vector<double>>(4, vector<double>(5)));