Multi-dimensional Dynamic Arrays

I'm trying to create a function that converts a custom structure - Spline - to a 2-dimension array of doubles. The problem is that although the function works fine and stores the correct values in the 2-dimension array p, it seems to store them localy. That is, if i try to access for example p[0][0] within the funcion, i can do it, however outside the function i just get a memory error, as if i was accessing the outer space (which i probably am). Can anyone help me out here?

Example:

Code:

---

double **knots;

void SplineToVector(const Spline spline, double **p, int *size)
{
        int i, j;
        *size = spline.sections_list_size + 3;
        p = new double*[*size];
        for(i = 0; i < spline.sections_list_size; i++)
        {
                p[i] = new double[3];
                for(j = 0; j < 3; j++)
                        p[i][j] = spline.sections_list[i].k_matrix[0][j];
        }
        for(i = 1; i < 4; i++)
        {
                p[spline.sections_list_size - 1 + i] = new double[3];
                for(j = 0; j < 3; j++)
                        p[spline.sections_list_size - 1 + i][j] = spline.sections_list[spline.sections_list_size - 1].k_matrix[i][j];
        }
        printf("Sample Knot: %f\n", p[0][0];  // NO ERROR HERE
}

void main()
{
        Spline example;
        //Other stuff related to Spline
        SplineToVector(example, knots, n_knots);
        printf("Sample Knot: %f\n", knots[0][0];  // MEMORY ERROR
}

---

You're not (or knot) returning a value to main (which is int main by the way)

Easy way is
knots = SplineToVector(example, n_knots);

Where your function declares
double **p
locally, and finishes with a
return p;

Worked, thnx.