Thread: Vector Of Vectors

Hi, I am Trying to create a vector of vectors

I have managed to create the vector structure
but now i need to add elements to it with a particular sequence

for example if i call the function, with a variable number (which = 5)

i want the vector to be able to go through and create a vector structure like
vector vector 0 = 1, 0, 0, 0, 0, 0
vector vector 1 = 2, 0, 0, 0, 0, 0
vector vector 2 = 3, 0, 0, 0, 0, 0
vector vector 3 = 4, 0, 0, 0, 0, 0
vector vector 4 = 5, 0, 0, 0, 0, 0

i have tried many ways but cannot seem to assign the correct values

Code:

vector<vector<int> > MYVEC; // create vector

void Initialise(vector<vector<int> > &MYVEC, int num) // function to initialise vector
{
        int v = 1;	// used to assign 1, 2, 3 ...
	int k = 0;	// used always assigning 0 to other elements

	for ( int i = 0; i < num; i++ ) 
	{
		MYVEC.push_back ( vector<int>() );
		
                MYVEC[i].push_back(i);

		for ( int j = 0; j < numVertices; j++ )
		{
			MYVEC[i].push_back(i);
			MYVEC[i][j] = 0;
		}
	}
}

This dosnt work and just assigns 0 to all elements,
so is like:
vector vector 0 = 0, 0, 0, 0, 0, 0
vector vector 1 = 0, 0, 0, 0, 0, 0
vector vector 2 = 0, 0, 0, 0, 0, 0
vector vector 3 = 0, 0, 0, 0, 0, 0
vector vector 4 = 0, 0, 0, 0, 0, 0

i need the first element of each vector in the big vector to be go up from 1, 2 ... etc

Thanks

Hi, thanks i have done it using

Code:

	int k = 0;	// used to assign 0 to other elements

	for ( int i = 0; i < num; i++ ) 
	{
		MYVEC.push_back ( vector<int>() );	

		for ( int j = 0; j < num; j++ )
		{
			MYVEC[i].push_back(i);	

			MYVEC[i][0] = (i+1);	// set first elem vector to 1...+
			MYVEC[i][j] = (k);		// set second elem...+ of vector to 0
		}
}

this seems to do what i need and gives me:
vector vector 0 = 1, 0, 0, 0, 0, 0
vector vector 1 = 2, 0, 0, 0, 0, 0
vector vector 2 = 3, 0, 0, 0, 0, 0
vector vector 3 = 4, 0, 0, 0, 0, 0
vector vector 4 = 5, 0, 0, 0, 0, 0


now if i need to search through the vector, for example to find where a certain number is, e.g. 1
i want it to return 1 location = 0 (as first elem of vec vec 0 is 1)
e.g. 2
i want it to return 2 location = 1 (as first elem of vec vec 1 is 2)

how would i do this?
thanks

Hi, ignore the last post I have done it.
Thanks =)

Thank that works =)

thanks sorry i fixed it.

I now need to be able to merge 2 vectors inside the big vector

e.g. i have
vector vector 0 = 1
vector vector 1 = 2
vector vector 2 = 3
vector vector 3 = 4
vector vector 4 = 5
vector vector 5 = 6

-----------------------------------------

i may need to merge vector vector 0 and 1
to get vector vector 0 = 1, 2
vector vector 1 = nothing

then may need to merge vector vector 2 and 3
to get vector vector 2 = 3, 4
vector vector 3 = nothing

then may need to merge vector vector 0 and 2
to get vector vector 0 = 1,2,3,4
vector vector 2 = nothing

could you please explain how this could be done
would i just have to push each vector the the vector

Hi, dont worry i figured it out.
thanks for all your help =)