vector of vectors?

[phorce]

Hello,

I need to store the cooridants of a vector, for example:

If the vector was:

0 1 0 1 0
0 1 0 1 0
0 1 1 1 1
0 0 0 0 0

And this vector is then split into blocks, I need to store the the corridents so I can then use them later to put the vector back together. Now I have managed to get the calculation to calculate the corridents, I just don't know how I'd go about setting them as a 2D vector..

Here is the function that handles the corridents:

vector<double> subsetMatrix(const iniMatrix& theMatrix, int mat_row, int mat_col, int offsetX, int offsetY, int newRow, intnewCol)
{  
    iniMatrix newMatrix;

    for(int i=offsetY; (i < newRow); i++)
    {
        for(int j= offsetX; (j < newCol); j++)
        {
            newMatrix.push_back(theMatrix[i*mat_row+j]);
            // i*mat_row+j IS the corridents 
        } 
    }
    return newMatrix;
}

I have a 2D vector defined in the class, I just need a way of pushing to this vector and then retriving it.

[Labdabeta]

Can you maybe post what your iniMatrix class looks like? Also just to maybe catch any premature problems here is some sample vector of vector code:

vector<vector<type> /*note the space that must be here*/> vec;
vector<type> newVec;//this can be set to actually hold something;
vec.push_back(newVec);
vector<type> backVec=vec.back();//this will return the whole vector
///Fake 1D version (in a class)
template<typename T>
class vec2D
{
    private:
    vector<T> vec;
    int w;
    T zero;//this is the default vector value
    public:
    vec2D(int h, int w, int v):w(w),zero(v)
    {
        for (int i=0; i<w*h; ++i)//set the vector to {v}
            vec.push_back(v);
    }
    T &operator()(int x, int y)
    {
        if (x*y>=vec.size())
        {
            //we need to reserve more space!
            if (x>w)
            {
                for (int xx=0; xx<x; ++xx)
                {
                    for (int i=0; i<vec.size()/w; ++i)
                        vec.insert(vec.begin()+i*w,zero);
                    w=x;
                }
            }
            if (y>vec.size()/w)
            {
                for (int yy=0; yy<y; ++yy)
                {
                    for (int i=0; i<w; ++i)
                        vec.push_back(zero);
                }
            }
        }
        return vec[y*w+x];
    }
};

NOTE: I may have made a mistake with my class and it could definately use some more functionality, it is merely for showing you how you COULD make a fake 2D-vector class.

[Labdabeta]

Sorry, I am still getting used to the new posting system, I guess I didn't do the code right. I cannot seem to figure out how to edit it either.