Moving and stopping simulation code?

2016 6 22
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更新时间：2016 6 22
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Hey guys, I want to simulate a simple moving and stopping simulation. A circle with move along a rectangular path, and then will stop for couple second in some determined spot, and finish after reach the starting point. Can you help me with the code? Thank you in advance.

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KSSV
KSSV 2016-6-22

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clc; clear all ;
N = 20 ;
x = linspace(0,1,N) ;
y = linspace(0,1,N) ;
[X,Y] = meshgrid(x,y) ;
% pick boundaries
x = [X(1,:)' ; X(:,end) ; flipud(X(end,:)') ;flipud(X(:,1))] ;
y = [Y(1,:)' ; Y(:,end) ; flipud(Y(end,:)') ;flipud(Y(:,1))] ;
% x(end) = [] ;y(end) = [] ;
% circle
th = linspace(0,2*pi) ;
r = 0.1 ;
for i = 1:length(x)
xc = x(i)+r*cos(th) ;
yc = y(i)+r*sin(th) ;
plot(x,y,'.-r') ;
hold on
plot(xc,yc,'b');
hold off
% if condition % put your condition to stop the circle
pause(0.1)
% end
end

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Rudi Gunawan
Rudi Gunawan 2016-6-22
Can you add some obstacle avoidance too? Just say at some spot the circle have to go out the path but then go back to the path after passing the obstacle. Thank you.
Rudi Gunawan
Rudi Gunawan 2016-6-22
编辑：Rudi Gunawan 2016-6-22
I got some problem with the if condition, it say "The expression to the left of the equals sign is not a valid target for an assignment." What should I do with this kind of problem? I have tried using 2 equal sign (==), it work but didn't stop the movement. What should I do?
KSSV
KSSV 2016-6-22
you have to read document....for if..you cannot expect each and every minor help online...

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