.. _user-guide_usage_data-structures: ************************** Data structures (overview) ************************** Magnopy has a number of data structures defined, that take care of a relatively separated concepts. Two of them are inherited from the |wulfric|_ package (:ref:`user-guide_usage_cell` and :ref:`user-guide_usage_atoms`). Some are used to store the parameters of spin Hamiltonian (:ref:`user-guide_usage_spin-hamiltonian` and :ref:`user-guide_usage_convention`). And some represents levels of theory and serve as a collection of the things that can be computed (:ref:`user-guide_usage_lswt`, :ref:`user-guide_usage_energy`). For the technical reference on how each function, class, method attribute functions see :ref:`api`.