Why doesn't this code continue to run the timerfunction?

Hi! I made a code to simulate the boid's behaviors; I made a model to learn an Agent-based-model. But, I do not know why it dose not keep running the timerfcn. On the first try, I think it does work. I guess on the second try, there are some problem.

I got the following error message. Error while evaluating TimerFcn for timer 'timer-1'

Cell contents reference from a non-cell array object.

I tried to figure it out by myself; however, I did not know what is the problem.

Is there anyone who helps me?

Please.... I really want to know what is the problem with my code.

My code file is following: function varargout = boid_ex(varargin) % BOID_EX MATLAB code for boid_ex.fig % BOID_EX, by itself, creates a new BOID_EX or raises the existing % singleton*. % % H = BOID_EX returns the handle to a new BOID_EX or the handle to % the existing singleton*. % % BOID_EX('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in BOID_EX.M with the given input arguments. % % BOID_EX('Property','Value',...) creates a new BOID_EX or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before boid_ex_OpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to boid_ex_OpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help boid_ex

% Last Modified by GUIDE v2.5 01-Apr-2014 17:16:24

%%% Make changes needed for proper look and feel and running on %%%different platforms %%prepareLayout(boids); %%allObjects = findall(topContainer); %%% Make GUI objects available to callbacks so that they cannot %%% be changed accidentally by other MATLAB commands %% set(allObjects(isprop(allObjects,'HandleVisibility')),... %% 'HandleVisibility','Callback');

% Begin initialization code - DO NOT EDIT gui_Singleton = 1; gui_State = struct('gui_Name', mfilename, ... 'gui_Singleton', gui_Singleton, ... 'gui_OpeningFcn', @boid_ex_OpeningFcn, ... 'gui_OutputFcn', @boid_ex_OutputFcn, ... 'gui_LayoutFcn', [] , ... 'gui_Callback', []); if nargin && ischar(varargin{1}) gui_State.gui_Callback = str2func(varargin{1}); end

if nargout [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:}); else gui_mainfcn(gui_State, varargin{:}); end % End initialization code - DO NOT EDIT

% --- Executes just before boid_ex is made visible. function boid_ex_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to boid_ex (see VARARGIN)

% Choose default command line output for boid_ex handles.output = hObject;

handles.N = 20; % define the number of boids % initialize boids position and velocity boid.pos = 5000.*rand(handles.N,2); boid.vel = [150.*rand(handles.N,1) 10.*rand(handles.N,1)]; boid_plotter(boid, handles) % call the function to plot the boids in the GUI window % create timer object handles.timer = timer(... 'TimerFcn', {@my_callback_fun,handles},'Period',.1, ... 'ExecutionMode','fixedRate','UserData',boid);

% Update handles structure guidata(hObject, handles);

% UIWAIT makes boid_ex wait for user response (see UIRESUME) % uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line. function varargout = boid_ex_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure varargout{1} = handles.output;

% --- Executes on slider movement. function slider1_Callback(hObject, eventdata, handles) % hObject handle to slider1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

% --- Executes during object creation, after setting all properties. function slider1_CreateFcn(hObject, eventdata, handles) % hObject handle to slider1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background. if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor',[.9 .9 .9]); end

% --- Executes on slider movement. function slider2_Callback(hObject, eventdata, handles) % hObject handle to slider2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

% --- Executes during object creation, after setting all properties. function slider2_CreateFcn(hObject, eventdata, handles) % hObject handle to slider2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background. if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor',[.9 .9 .9]); end

% --- Executes on slider movement. function slider3_Callback(hObject, eventdata, handles) % hObject handle to slider3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

% --- Executes during object creation, after setting all properties. function slider3_CreateFcn(hObject, eventdata, handles) % hObject handle to slider3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background. if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor',[.9 .9 .9]); end

% --- Executes on button press in start. function start_Callback(hObject, eventdata, handles) % hObject handle to start (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) start(handles.timer);

% --- Executes on button press in stop. function stop_Callback(hObject, eventdata, handles) % hObject handle to stop (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) stop(handles.timer)

% --- Executes on button press in reset. function reset_Callback(hObject, eventdata, handles) % hObject handle to reset (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) stop(handles.timer) % initialize boids position and velocity boid.pos = 5000.*rand(handles.N,2);; boid.vel = [150.*rand(handles.N,1) zeros(handles.N,1)]; set(handles.timer,'UserData',boid)

function my_callback_fun(obj,event,handles)

% get data boid = get(obj,'UserData'); % move boids [boid.pos,boid.vel] = move_all_boids(boid.pos,boid.vel,handles); % plot boids boid_plotter(boid,handles) % update data set(obj,'UserData',boid);

function boid_plotter(boid,handles) h = axis(handles.axes1); plot(boid.pos(:,1),boid.pos(:,2),'o') axis([0 5000 0 5000]); set(gca,'XTick',[],'YTick',[]) hold on for i=1:size(boid.vel,1) plot([boid.pos(i,1) boid.pos(i,1)+boid.vel(i,1)],... [boid.pos(i,2) boid.pos(i,2)+boid.vel(i,2)],'r') end hold off

function [pos,vel] = move_all_boids(pos,vel,handles) h = findobj(gcf,'Style','slider'); behavior_strength = get(h,'Value'); % cycle through all boids for i=1:size(pos,1)

    % calculate behaviorial velocity maneuvers
    separation = 1*behavior_strength{1}*avoid(pos,i,200);
    allignment = 5*behavior_strength{2}*match_vel(vel,i);
    cohesion = .5*behavior_strength{3}*center_of_mass(pos,i);
    % update boid
    vel(i,:) = vel(i,:) + separation + allignment + cohesion;
    % keep velocity magnitude constant (150)
    vel(i,:) = 150*(vel(i,:)/norm(vel(i,:)));
    % update position and restrict the values within the plot axis (mod.m,  % modulus function)
    pos(i,:) = mod(pos(i,:) + vel(i,:),5000);
end

%--------------------------------------------------------------- function v1 = center_of_mass(pos,i) % function to move each boid towards the precieved % center of mass of the rest of the flock % percieved center of mass pc = (sum(pos,1) - pos(i,:))/(size(pos,1)-1); % move the boid towards the center by 1% v1 = 0.01*(pc - pos(i,:)); %--------------------------------------------------------------- function v2 = avoid(pos,i,dist) % function to move each boid away from other boids v2 = [0 0]; for k = 1:size(pos,1) if k ~= i if norm(pos(i,:) - pos(k,:)) < dist v2 = (pos(i,:) - pos(k,:))-v2 ; end end end %--------------------------------------------------------------- function v3 = match_vel(vel,i) % function to match each boids velocity with near birds % note: same as rule one but with velocity rather than position pv = (sum(vel,1) - vel(i,:))/(size(vel,1) - 1); v3 = 0.01*(pv - vel(i,:));

% --- Executes on slider movement. function slider4_Callback(hObject, eventdata, handles) % hObject handle to slider4 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

% --- Executes during object creation, after setting all properties. function slider4_CreateFcn(hObject, eventdata, handles) % hObject handle to slider4 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles empty - handles not created until after all CreateFcns called

% Hint: slider controls usually have a light gray background. if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor')) set(hObject,'BackgroundColor',[.9 .9 .9]); end