def set_pos_array(self,pos_array):
		self._pos = pos_array
Tests that a value for sigma is returned when the group contains 1 param
dataset/ETHPy150Open networkdynamics/zenlib/src/zen/view.py/View.set_pos_array--crossover with--dataset/ETHPy150Open SALib/SALib/SALib/tests/test_analyze_morris.py/test_sigma_returned_for_groups_with_only_one_param