function?action=action_selector（stat）

global?NA?


ran=rand（1）;

candidate=1;

sum=1/NA;

complete=0;

%?Selecting?each?action?with?equal?probability?

while?0==complete

????????if?ran????????%?action?selected?
????????action=candidate;
????????complete=1;
????????
????????else??????????
????????%?test?if?ran?is?associated?with?next?action?
????????candidate=candidate+1;
????????sum=sum+（1/NA）;
????????end
end