update

models.py

models_data/first_tetraeder_constraints_data.csv

models_data/first_tetraeder_elements_data.csv

models_data/first_tetraeder_forces_data.csv

models_data/first_tetraeder_nodes_data.csv

models_data/small_bridge_constraints_data.csv

models_data/small_bridge_elements_data.csv

models_data/small_bridge_forces_data.csv

models_data/small_bridge_nodes_data.csv

models_data/small_tetraeder_constraints_data.csv

models_data/small_tetraeder_elements_data.csv

models_data/small_tetraeder_forces_data.csv

models_data/small_tetraeder_nodes_data.csv

tests.py