Code Forums - View Single Post - Creating and Using a 2 dimensional Vector (vector of vectors)

xytor · 09-11-2005, 10:30 AM

I am having trouble understanding how to create a 2 dimentional vector (a vector of vectors) and have it act like I want it to.

Code:

void test2dVector(){
 vector <vector <int> > v; //*two dimensions
 v.push_back(vector <int>()); //*create v[0]
 v.push_back(vector <int>()); //*create v[1]
 v[0].push_back(15); //*assign v[0][0]
 v[1].push_back(16); //*assign v[1][0]


	    for(size_t i=0;i<v.size();i++)
  {
   for (size_t j=0;j<v[i].size();j++)
   {
       cout<<v[i][j]<<" "; //I am not sure that this will work! Will it?
}
   cout<<"\n";
}



}

In this code, I try to create and use a 2-d vector.
I still do not understand how to make it act like a real 2-d array, meaning, creating an actual grid-like structure, as opposed to this, which only covers one column.

So once and for all, can somebody FULLY explain how to do this, completely?

09-11-2005, 10:30 AM	#1 (permalink)
xytor Registered User Join Date: Sep 2005 Posts: 4	Creating and Using a 2 dimensional Vector (vector of vectors) I am having trouble understanding how to create a 2 dimentional vector (a vector of vectors) and have it act like I want it to. Code: void test2dVector(){ vector <vector <int> > v; //two dimensions v.push_back(vector <int>()); //create v[0] v.push_back(vector <int>()); //create v[1] v[0].push_back(15); //assign v[0][0] v[1].push_back(16); //*assign v[1][0] for(size_t i=0;i<v.size();i++) { for (size_t j=0;j<v[i].size();j++) { cout<<v[i][j]<<" "; //I am not sure that this will work! Will it? } cout<<"\n"; } } In this code, I try to create and use a 2-d vector. I still do not understand how to make it act like a real 2-d array, meaning, creating an actual grid-like structure, as opposed to this, which only covers one column. So once and for all, can somebody FULLY explain how to do this, completely?