Multi-Dimension Vectors

[hfbroady]

Ok I'm trying to create matrix of data that I can add values to based on a reading that I will get from a DVM. I'm using a 3d vector to do this. I need to keep track of the serial number, the day and within day I need to take two readings at different temps, this will continue for 7 days.

The rows of my 3d vector will be the days, the colums will be the serial numbers the depth will be the reading at the different temps.

What I need to do is compare the first element (days) and when it is greater then or equal to 4 I will perform calculations of the readings. So all I want to do is compare the first element of the vector, How do I do this?

Here is what I got

#include <vector>
typedef std::vector<double> Double1D;
typedef std::vector<Double1D> Double2D;
typedef std::vector<Double2D> Double3D;

#define HEIGHT 5
#define WIDTH 3
#define DEPTH 7

int main() 
{
   Double3D array3D(HEIGHT, Double2D(WIDTH, Double1D(DEPTH)));
  // Put some values in
  // The second element will have 2 readings for each temp so the depth will be 2*5=10 but the last four only used for day 7

     array3D[3][1][4] = 5.5; // this is for the 20k pots
  
  return 0;
}