//* Declaring a 2D vector of a specific size *
#include <iostream>
#include <vector>
using namespace std;


template <typename T>
void PRINT(const vector< vector<T> > &M) {
    for (unsigned int r=0; r<M.size(); r++) {        // M.size() tells the number of rows
        for (unsigned int c=0; c<M[r].size(); c++)   // M[r] is a 1D vector of columns
            cout << "\t" << M[r][c];        // and has its size information too
        cout << endl;
    }
}


int main() {
    unsigned int rows, cols;
    cout << "Please specify the size of the vector in rows and columns: ";
    cin >> rows >> cols;
    double ini;
    cout << "Please specify the initial value of each element: ";
    cin >> ini;

    vector<vector<double> > W(rows, vector<double>(cols, ini));
    // create a 1D vector of vector<double> that has rows elements
    // initialize each element of 1D vector to a vector of doubles 
    //      of cols elements, and set each of those elements to ini

    PRINT(W);

    return(0);
}