set an element of an array of pointers to a pointer in c

From what I understand, you simply want to access the elements of matrix as martrix[a][b] and not matrix.array[a].

First thing first, your operator[]() is inefficient.

1. It won’t be able to handle the cases of matrix with width other than 2.

   To correct that, you need to change

   Vector v = new Vector(2);

   to

   Vector v = new Vector(width);

2. You are making a new Vector each time the operator is called.

Instead you can follow the below suggestion.

1. Change double* array in Matrix class to Vector* array

2. Matrix Constructor to

   Matrix(int _height , int _width) : height(_height), width(_width) {
        array = new Vector[height];  // new Vector(width)[height] does not work. Someone, please check. Till then give a default value in Vector constructor to make that work
        for(int i=0;i<height;++i) {
            array[i] = Vector(width);
        }
    }
   

3. operator[]() in Matrix class to

   Vector& operator[](int x) {
       return array[x];
   }