Question on cell arrays

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jana
jana 2013-12-16
评论： jana 2013-12-16
Hi, I wanted to create a set of random numbers. I used the following code:
for i = 1:n
for j = 1:n
Sc{i,j} = sort((randperm(m,randi(m))));
end;
end;
This creates a cell array containing a set of random integers from 1 to 5. example Sc{1,1} = [1,3,4] I think, randi function uses uniform distribution. I want to control size of the set with some probabilty. For example I want my set to contain all 5 elements with a probability of .5 and and a set with 4, 3, 2,1 elements with probability .1 each. Is there a function that I could use in matlab ? Thanks

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回答（1 个）

Walter Roberson
Walter Roberson 2013-12-16
y = randsample(n,k,true,w) or y = randsample(population,k,true,w) returns a weighted sample taken with replacement, using a vector of positive weights w, whose length is n. The probability that the integer i is selected for an entry of y is w(i)/sum(w). Usually, w is a vector of probabilities. randsample does not support weighted sampling without replacement.
  1 个评论
jana
jana 2013-12-16
Walter,
I don't quite understand how that works in the problem specified above. I am particularly looking at choosing a set of some size with a specified probability.
For example : I would choose Sc[i,j] of size 4 with a probability .5 and so on. I am not sure how the above function is going to help me with that.

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