Choose randomly between two functions

Hello!

I'm implementing a Double Q-Learning Algorithm to the pendulum-v0. I'm looking at the pseudocode and there's one part of the algorithm which I'm not sure how to write.

If you see on line 8, it states:

With Pr = 0.5:

Q_a(s,a)

else

Q_b(s,a)

Alternatively the choice between Q_a and Q_b can be random. How can I implement this in my code so that for each episode either Q_a or Q_b are selected and run?

Thank you in advance!

[dpb]

P = 0.5;        % the split level
if rand()>=P
  res=fnA();
else
  res=fnB();
end

Answer 1

[David Hill]

randbit=randi(2,1,numEpisodes)-1;
for k=1:numEpisodes
    if randbit(k)
        Q_a(s,a)
    else
        Q_b(s,a)
    end
end