Vector with arguments declared in for loop not acting right

[Lazauya]

This code compiles correctly, but the las cout statement returns "(0,2.42092e-322)" The input file I used is

2
4
(0,0) (0,1) (0,2) (0,3)
(1,0) (1,1) (1,2) (1,3)
(2,0) (2,1) (2,2) (2,3)
(3,0) (3,1) (3,2) (3,3)

(0,0) (0,1) (0,2) (0,3)
(1,0) (1,1) (1,2) (1,3)
(2,0) (2,1) (2,2) (2,3)
(3,0) (3,1) (3,2) (3,3)

#include <iostream>
#include <boost/mpi/communicator.hpp>
#include <boost/mpi/environment.hpp>
#include <complex>
#include <vector>
#include <fstream>
#include <sstream>

using namespace std;

int main(int argc, char* argv[])
{
   typedef vector<vector<vector<complex<double> > > > chmatrix; //define ~common types (for fun, honestly)
   typedef vector<vector<complex<double> > > cmatrix;

   vector<complex<double> > input_vector;

   int matrix_size, matrix_amount, depth, row, col;

   complex<double> temp_cmpl_db;

   string temp_str_gtl_mat_dt, temp_str_gtl_int_dt; //temporary strings for retrieving matrices

   /*if(!argv)
   {
        cout << "error: no input file specified" << endl;

        return 1;
   }*/

   fstream input_file("example.txt");

   chmatrix input_matrices_transfer;

   if(input_file.is_open())
   {
        getline(input_file, temp_str_gtl_int_dt, ' ');
        matrix_amount = stoi(temp_str_gtl_int_dt, nullptr);
        getline(input_file, temp_str_gtl_int_dt, ' ');
        matrix_size = stoi(temp_str_gtl_int_dt, nullptr);

        chmatrix input_matrices(matrix_size, vector<vector<complex<double> > >(matrix_size, vector<complex<double> >(matrix_amount)));
        chmatrix input_matrices_temp(matrix_size, vector<vector<complex<double> > >(matrix_size, vector<complex<double> >(matrix_amount)));

        for(unsigned int matrix_index = 0; matrix_index < matrix_amount*matrix_size*matrix_size; matrix_index++)
        {
            getline(input_file, temp_str_gtl_mat_dt, ' ');
            cout << temp_str_gtl_mat_dt << endl;

            if(temp_str_gtl_mat_dt != "\n")
            {
                depth = matrix_index/(matrix_size*matrix_size);
                row = (matrix_index - (matrix_size*matrix_size*depth))%matrix_size;
                col = (matrix_index - (matrix_size*matrix_size*depth))/matrix_size;

                istringstream temp_conv_comp(temp_str_gtl_mat_dt);
                temp_conv_comp >> input_matrices[row][col][depth];
                cout << input_matrices[row][col][depth] << endl; //this works

            };

            cout << input_matrices[2][2][2] << endl; //this also works
            input_matrices_transfer = input_matrices;
        };


        input_file.close();

        cout << input_matrices_transfer[2][2][2] << endl; //this doesn't work
   }
   else
   {
    cout << "error: cannot find/open input file" << endl;
    return 1;
   };

   return 0;
};

Sorry I posted my entire contents, but I really don't know what part of it's causing the problem.
The matrix_size is 4 in this case, so the vector contains vectors containing complex numbers it's 4x4x4.

[48T7M4Gy]

Who wrote the program?

[Lazauya]

I wrote it.

[48T7M4Gy]

So, correct me if I'm wrong, and I'm sure you will, why is line 69 referring to a 3d array while your input appears to me to be 2d? I must be missing something.

[Lazauya]

input_matrices_transfer is chmatrix (custom hyper matrix if you were wondering)
input_matrices is also a chmatrix

input_matrices_temp is unused here, sorry.

line 62 and 63 was just me trying desperately to fix whatever is going on.

[Lazauya]

Everytime I try calling the arrary outside the for loop, I get a strange double value and I don't know where the problem is happening at.

[48T7M4Gy]

You're making it sound too complicated, and maybe I'm missing something but input_matrices_transfer[2][2][2] is a 3d array of doubles. How that is different from what you say is beyond me.

However a very-near-zero double is 2.42092e-322. i.e. You have a rounding error and there's nothing you can do about it other than allow for it !

[Lazauya]

You're right, sorry, yes, input_matrices_tranfer is a 3d array of doubles. However, the output should be (2,2) in the second cout statement, but instead it's as you said a very near zero value (which i guess is essentially zero). The array was initiallized to a zeros (0,0) but I changed the values in the for loop. But when I try and access the element it's there but its nowhere near the right value because they are all (0,0) (or close to that) for some reason.

[Lazauya]

NEVERMIND I'M REALLY DUMB SORRY! I was trying to access an element that didn't exist, I forgot that arrays start at 0 instead of 1 so the element 2 doesn't exist. Sorry.

[48T7M4Gy]

Please use line numbers. :)

[48T7M4Gy]

I guess that solves it?