Preserve the methods of an object after it is updated

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Umit
Umit 2012-2-16
编辑： Andrei Bobrov 2013-10-14
classdef AgentAlgorithm < handle
properties (GetAccess = 'public', SetAccess = 'private')
Detections = []
State = []
Tracks = []
end
properties (GetAccess = 'public', SetAccess = 'private') %PROTECTED
Batch; %Used to store previous states and properties
%Batch(1) = T-1 state, Batch(2) = T-2 state, so on so forth
end
properties (Hidden, Constant)
MaxBatchLength = 5;
end
methods
%Constructor of Agent
function Agent = AgentAlgorithm(State)
Agent.State = State;
NewBatch = Agent.CreateBatch([], [], []);
Agent.Batch = NewBatch;
end
%New State & Detections initilizer for Agent
function Agent = AgentUpdate(Agent, NewState, NewDetections)
%Create last state Batch
NewBatch = Agent.CreateBatch(Agent.Detections, Agent.Tracks, Agent.State);
%If Batch is empty (Not initilized yet)
if isempty(Agent.Batch(1).State)
Obj.Batch = NewBatch;
else
Obj.Batch = [NewBatch Agent.Batch];
end
%Update with new parameters
Obj.State = NewState;
Obj.Detections = NewDetections;
Agent = Obj;
end
end
methods (Static, Access = 'private')
%Creates a new batch with given parameters
function NewBatch = CreateBatch(Detections, Tracks, State)
NewBatch = struct('Detections', Detections,...
'Tracks', Tracks, 'State', State);
end
end
end
Question: When I call this object as follows:
AAA = AgentAlgorithm(1)
methods(AAA)
Methods for class AgentAlgorithm:
AgentAlgorithm delete findprop isvalid ne
AgentUpdate eq ge le notify
addlistener findobj gt lt
AAA = AAA.AgentUpdate(2,3)
methods(AAA)
Methods for class struct:
amd ctranspose fieldnames ichol linsolve permute struct2cell
cholinc display fields ilu luinc reshape transpose
My problem is how can I use AgentUpdate(x,y) function such that at the end of I use this function, I still have the updated version of AAA object with all methods (AgentAlgorithm, AgentUpdate) after constructor called instead of a new AAA object w/o any user defined methods left. I used handle, did not work as I expected as you can see.

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采纳的回答

Honglei Chen
Honglei Chen 2012-2-16
In your method AgentUpdate, don't use Obj. Just use AAA directly. Again, the way you wrote it now, Obj is a struct and when you do AAA=Obj at the end, your AAA becomes a struct.
function AgentUpdate(Agent, NewState, NewDetections)
%Create last state Batch
NewBatch = Agent.CreateBatch(Agent.Detections,...
Agent.Tracks, Agent.State);
%If Batch is empty (Not initilized yet)
if isempty(Agent.Batch(1).State)
Agent.Batch = NewBatch;
else
Agent.Batch = [NewBatch Agent.Batch];
end
%Update with new parameters
Agent.State = NewState;
Agent.Detections = NewDetections;
end
In addition, because AgentAlgorithm is a handle class, in your definition of the method, you don't have to put Agent as the output.

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