Question about Young's modulus

Dear LAMMPS.

I practiced calculating Young’s modulus.

And I could get experimental value. But the problem was I could not compare theoretical value.

How can I get the theoretical value?

Thanks.

Dear LAMMPS.

I practiced calculating Young's modulus.

And I could get experimental value. But the problem was I could not compare
theoretical value.

How can I get the theoretical value?

​this sounds like a question that you should rather ask your adviser.​