function?[plaza?v?time?departurescount?departurestime]?=?clear_boundary（plaza?v?time）
%
%?clear_boundary??remove?the?cars?of?the?exit?cell
%
%?USAGE:?[plaza?v?time?departurescount?departurestime]?=?clear_boundary（plaza?v?time）
%????????plaza?=?plaza?matrix
%????????????????1?=?car?0?=?empty?-1?=?forbid?-3?=?empty&booth
%????????v?=?velocity?matrix
%????????time?=?time?matrix?to?trace?the?time?that?the?car?cost?to?pass?the?plaza.
%
%?zhou?lvwen:?zhou.lv.wen@gmail.com

departurescount?=?0;
departurestime?=?[];
[ab]?=?size（plaza）;
for?i?=?2:b-1
????if?plaza（ai）?>?0
????????departurescount?=?departurescount?+?1;
????????departurestime（departurescount）?=?time（ai）;
????????plaza（ai）?=?0;
????????v（ai）?=?0;
????????time（ai）?=?0;
????end
end

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?-rwxrwxrwx???????790??2011-07-28?22:42??traffic（zhoulvwen）\clear_boundary.m

?-rwxrwxrwx??????1544??2013-11-14?09:08??traffic（zhoulvwen）\create_plaza.m

?-rwxrwxrwx??????2419??2012-03-10?16:22??traffic（zhoulvwen）\main.m

?-rwxrwxrwx??????2663??2013-11-14?09:16??traffic（zhoulvwen）\move_forward.m

?-rwxrwxrwx??????1133??2011-07-29?08:58??traffic（zhoulvwen）\new_cars.m

?-rwxrwxrwx???????874??2011-08-14?16:43??traffic（zhoulvwen）\show_plaza.m

?-rwxrwxrwx??????2009??2011-08-14?17:43??traffic（zhoulvwen）\switch_lanes.m

?drwxrwxrwx?????????0??2013-11-14?20:36??traffic（zhoulvwen）

-----------?---------??----------?-----??----

????????????????11432????????????????????8