Loading .dat file into 2D vector

[macyhernz]

I have a .dat file with one long row of integers separated by a space. I need to load this file into a 2D vector of specific rows and columns. Any pointers on where to start would be greatly appreciated. So far, all my code does is successfully open the file.

[48T7M4Gy]

Best place to start with this is to write some pseudocode

[ericM]

you start building a 2d array to store your values

#include <array>
// ... some stuff here
typedef std::array<std::array<int>, COL>, ROW> yourMatrix;

After that you write a nested cycle to read numbers from the file

yourMatrix aMatrix;
if(inputStream.is_open()){
  for(int i = 0; i< COL; i++){
    for(int j = 0; j< ROW; j++){
      inputStream >> aMatrix[j][i];
    }
  }
}

This code assume you already know the number of rows (ROW) and columns (COL) of your matrix.

EDIT:: I read in numbers columnwise, which is the FORTRAN standard. In c++ I suppose is better to read the values row by row, but I am not 100% sure about that (in c I am sure).