Thread: Reading from file into 2D vectors

I am trying to read input from a text file into a 2-D vector where each of the rows should represent a vector itself. The first entry from each row should tell how many columns are in the row, then populate the column vectors, and the row vector.

However, I am getting some errors in my output.

In code form, I have tried to do this as

Code:

#include<iostream>
#include<fstream>
#include<vector>


#define Numrow 10 // clinical data sets


typedef std::vector<double> vec;
typedef std::vector<vec> vec2;


int main()
{
    std::ifstream infile1("data1.txt");






    vec2 Timerow(Numrow);


    int n; // number of timepoints


   if (infile1.is_open())
    {
        for (int i = 0; i < Numrow; ++i)
        {
            vec tdata;
            infile1 >> n;
            double t0;




            for (int j = 0; j < n; ++j)
            {
              infile1 >> t0;
              tdata.push_back(t0);
            }


            Timerow.push_back(tdata);


        }


    for (vec tdata : Timerow) std::cout << tdata.size() << std::endl;


    }


    else
    {
     std::cerr << "The file is not open" << std::endl;
    }

}

Data.txt

2 0.1 0.2
3 0.2 0.3 0.4
4 0.3 0.4 0.5 0.6
5 0.4 0.5 0.6 0.7 0.8
6 0.5 0.6 0.7 0.8 0.9 0.10
2 0.1 0.2
3 0.2 0.3 0.4
4 0.3 0.4 0.5 0.6
5 0.4 0.5 0.6 0.7 0.8
6 0.5 0.6 0.7 0.8 0.9 0.10

When I try to test the number of columns on each row I get this output:

0
0
0
0
0
0
0
0
0
0
2
3
4
.
.
.
6

why am I getting the first 10 zeros? Is there something I am doing wrong? If so, where and how can I fix it?

Thanks

Ha! Thanks a bunch. I don't know how I missed that but I am extremely grateful.