How to use Multidimensional vector in C++

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Hi,

I got some problem to set the values in 2d and 3d vector.
I want to know the process to create and return the 2dimensional and 3dimensional vector values where size will be changed dynamically.

I also tried the following code but i didn't get any help:

3D vector:

C++

vector < vector < vector<int> > > tube;

for(int i=0;i<2;i++)
{
   for(j=0;j<4;j++)
   {
     for(k=0;k<15;k++)
     {
     tube.push_back( vector< vector<int> >() );
     tube[k].push_back (vector<int> ());
     tube[i][j].push_back(value)
     }
   }
}

but I don't know whether it will work and also don't know where should I set i,j,k parameter.

and I also want to do the same thing for 2d vector

Please let me know that what is the correct way to do this.

Thanks...

Posted 10-Sep-12 9:19am

saqib.akhter

Updated 10-Sep-12 9:20am

v2

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Comments

Sergey Alexandrovich Kryukov 10-Sep-12 15:32pm

Not clear what's the problem? To try to run your code and see what happens? What is that supposed to mean "where should I set i, j, k parameter"? You set them where you want to access the element by index...
--SA

2 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Accepted Answer · 2012-09-10T09:42:00

Possibly you mean something similar to

C++

#include <iostream>
#include <vector>
#include <cstdlib>
using namespace std;



int main ()
{
  vector < vector < vector<int> > > tube;
  for(int i = 0; i < 2; i++)
  {
    vector < vector < int > > w;
    tube.push_back( w );
    for(int j = 0; j < 4; j++)
    {
      vector <int> v;
      tube[i].push_back( v );
      for(int k = 0; k < 15; k++)
      {
        tube[i][j].push_back( rand());
      }
    }
  }

  for (size_t i = 0; i < tube.size(); i++)
    for (size_t j = 0; j < tube[i].size(); j++)
      for (size_t k = 0; k < tube[i][j].size(); k++)
        cout << "tube[" << i << "][" << j << "][" << k << "] = " << tube[i][j][k] << endl;   
}

?

pasztorpisti · Accepted Answer · 2012-09-10T09:33:00

C++

vector < vector < vector<int> > > tube;
for(int i=0;i<2;i++)
{
   tube.push_back(vector<vector<int> >());
   for(int j=0;j<4;j++)
   {
       tube[i].push_back(vector<int>());
       for(int k=0;k<15;k++)
       {
           tube[i][j].push_back(value);
       }
   }
}

OR more efficiently:

C++

vector < vector < vector<int> > > tube;
tube.resize(2);
for(int i=0;i<2;i++)
{
   tube[i].resize(4);
   for(int j=0;j<4;j++)
   {
       tube[i][j].resize(15, value);
   }
}

However if you have to use and resize 3D vectors often then its profitable to write a specialized class for the job but that's a bit more difficult than what we are discussing here.

How to use Multidimensional vector in C++

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How to use Multidimensional vector in C++

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