STL vector<float> vecs, multidimensional

Hi there,
I'm new to C/C++ and need some help. under www.cppreference.com in the STL there is a Template of vector to make vectors. How can i make this Vector multidimensional?
My target is a 2dimensional array, which contains a list of vectors.
I have a file with 3 floats in a row, which needs to be written in a multidimensional array.
Coords x y z
in
vecs[num][x]
vecs[num][y]
vecs[num][z]

Thanks in advance!
Jan

You mean you can't/aren't going to just create a struct that contains the three points and use that struct as the type for the vector object?

Code:

struct coord
{
    float x;
    float y;
    float z;
};

vector<coord> CoordVector;

Doesn't seem to me that you really need to make this a multidimensional vector. Are there design considerations/requirements here that are pushing you towards this decision?