Array of vectors

Is it possible to have an array of vectors, or a vector of vectors?
This would be in place of a 2d array.

Yes.

I tried creating it like this but it doesn't work. What is the proper way of creating one dynamically?

Code:

k = vars.NumScan;

vector <long int> vectAWords[k];

Here is an example of a 3d array of vectors emulating a matrix using references to avoid copying:

Code:

#include <iostream>
#include <vector>

using namespace std;

int main(){
    int x = 3, y = 3, z = 3;
    int i, j, k;
    vector < vector < vector < int > > > matrix3d;

    matrix3d.resize(x);
    for (i=0; i<x; i++){
        vector < vector < int > > &vect2d = matrix3d[i];
        vect2d.resize(y);
        for (j=0; j<y; j++){
            vector < int > &vectLastD = vect2d[j];
            vectLastD.resize(z);
            for (k=0; k<z; k++){
                vectLastD[k] = i+j+k;
            }
        }
    }

    for (i=0; i<x; i++){
        for (j=0; j<y; j++){
            for (k=0; k<z; k++){
                cout << matrix3d[i][j][k] << ' ';
            }
            cout << endl;
        }
        cout << endl;
    }

    return 0;
}

What is the proper way of creating one dynamically?
The usual, e.g.

Code:

std::vector<int>* foo;
foo = new std::vector<int>[size];
//use foo for some devious purpose
delete[] foo;

But yeah, a vector of vectors might be better.

OK.
That's intense, took me a while to figure out all the counters and such.

Looking at that example, I tried this code :

Code:

int TempWord = 0;

	long int *AWordMtx;

	AWords = new long int[vars.NumScan];

	for (j=0; j< vars.NumScan; j++)
	{
		vector <long int> AWordLine = AWordMtx[j];

		for( i=0; i< vars.vectParmSelected.size(); i++)
		{
			TempValue = i+2;

			if(TempValue > 1)
				AWordMtx[i].AWordLine.push_back(TempWord);

		}
	}

I know it's wrong, how would it be fixed?

> The usual, e.g.

Oh, It's always easier then I think. I'll give it a shot

There's no reason to dynamically allocate an array of vectors. Try giving a vector of vectors a shot.