How can I randomly extract a element in an array?

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Louis Liu
Louis Liu 2017-11-11
评论： Louis Liu 2017-11-11
If now I have an array, how can I randomly extract a element in it? x0_1 = [ 0 0 0 1 1 1 2 2 2 2 ];
Actually, I want to prove the limiting distribution of Markov chain by Matlab and I was given a initial probability P(X0 = 0) = 0.3, P(X0 = 1) = 0.3, P(X0 = 2) = 0.4.
Professor tells us to use the probability above to extract the first one state and if I get the state1, just follow the probability of state1 in transition probability matrix to get the next state but I am not very sure how to do ...
Hope you can tell me how to randomly extract a element in the vector. Thanks!

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mounika
mounika 2017-11-11
If it is just about how to extract an element randomly, you can try by random indexing, you can try the following for the given vector:
x = [0 0 0 1 1 1 2 2 2 2];
len = length(x);
for i = 1:length(x)
y = randi([1 len],1,1); % generates random number for indexing
disp(x(y));
end

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