I can't seem to get the syntax correct for a pointer to pointer to const length array

[David Frank]

For a runtime calculated dimension of size NX the following syntax is correct.

  double (*var)[2] = new double[NX][2];
 

But what I also want is a runtime dimensioned array of pointers to these guys but I can not find the proper syntax. Something akin to the following (which is wrong).

  double *(*var)[2] = new double*[NX][2];
  for(i=0; i<NX; ++i)
    {
    var[i] = new double[NY][2]; // NY != NX
    }
 

What is the correct syntax?

[weaknessforcats]

This dynamically allocates a 2D array.

var is a pointer to an array of 2 doubles.

    double (*var)[2] = new double[NX][2]; 

Now to allocate an array of pointers to arrays of 2 doubles you code:

    double* (*ptr)[2] = new double* [NX][2];

Now ptr is an array of pointers that contain addresses of arrays if 2 doubles.

Finally, you assign to the ptr array by:

*(ptr[0]) = var[0];

since ptr[0] is an address of a pointer it must be that
*(ptr[0]) is element 0 of the ptr array. Therefore, you assign var[0] (which is the address of an array of 2 double) to *(ptr[0]) which is also the address of an array of 2 double.