MATLAB: Making moving obstacles in an matlab

MATLAB

I have created random obstacles in MATLAB, (they are user acquired) now I am trying to make some obstacles randomly moving.
I Know that, in every iteration value of some obstacle be updated by adding some threshold valueto it.
But I am getting how to write up in code.
Kindly help me

Best Answer

After long 7 month of training and research i reached a success. Here is what i've achieved
clc,clear
px = 5*rand(10,1);         % initial position
py = 5*rand(10,1);
plot(px,py,'.r')
axis([-1 1 -1 1]*20)
hold on
t = 360*rand(size(px));    % initial direction in degree
for i = 1:20               % number of iterations
    dx = 0.5*cosd(t);      % how fast we move
    dy = 0.5*sind(t);
    t = t + 90*(0.5-rand(size(px)));    % change direction (-45:45) degree
    plot([px px+dx]', [py py+dy]')      % plot displacement
    px = px + dx;                       % new position
    py = py + dy;
    h = plot(px,py,'.b');               % plot new position
    pause(0.2)                          % wait
    delete(h)                           % remove new position
                                        % from graph
end
hold off
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