this the issue concerning the class antennaArray, in this clas there is those methods : ```python getNumberElements() Returns the number of elements in the array. getElementPosition(elementID) Returns the position of the specified element. getElementExcitation() Returns the excitation coefficient of the specified element. setElementPosition(elementID, position) Modifies the position of the specified element. setElementExcitation(elementID, excitationMag, excitationPha) Modifies the excitation coefficient of the specified element. addElement(position, excitationMag, excitationPha) Add a new radiating element to the array, with position and excitation coefficient as specified by the input parameters. deleteElement(elementID) Eliminates the specified element from the array. calculateAF(theta, phi) Returns the array factor values, evaluated of the grid of specified theta/phi points. ```