MATLAB Object-Oriented Programming

end

end

end

end

The ProjectEngineer class requires a cell array of names, a numeric array of phone

extensions, and a cell array of billing rates for each engineer in the team.

nm = {'Fred','Nancy','Claudette'};

px = [8112,8113,8114];

rt = {'C2','B1','A2'};

tm = ProjectEngineer(nm,px,rt)

tm =

1x3 ProjectEngineer array with properties:

Rate

Name

PhoneX

Potential Error

The TeamMembers constructor initializes the object array with this statement:

obj = repelem(obj,1,n);

Because the obj argument to repelem is a ProjectEngineer object, the array

returned is of the same class.

Without this statement, the TeamMembers constructor would create default objects to fill

in array elements in the for loop. The resulting heterogeneous array would be of the

class of the common superclass (TeamMembers in this case). If the superclass returns this

heterogeneous array to the subclass constructor, it is a violation of the rule that class

constructors must preserve the class of the returned object.

MATLAB issues this error:

When constructing an instance of class 'ProjectEngineer', the constructor must

preserve the class of the returned object.

Error in ProjectEngineer (line 8)

obj = obj@TeamMembers(varargin{1:2});

10 Object Arrays