How to randomly generate an integer which is unique during multiple iterations

2015 10 27
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How to generate a random integer in the range of 1 to 100 uniquely when the program is run and which undergoes multiple iterations? When I am using randi as follows, it is generating integer randomly but at times its not unique when the program is run in multiple iterations
index{i} = randi([1 100],1,1);

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Jos (10584)
Jos (10584) 2015-10-27

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You can use the function randperm for this:
N = 10
R = randperm(N)
for k=1:N
Current_Random_Integer = R(k)
end

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