How to create a set of random numbers

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Joy 2017-3-30

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评论： Joy 2017-3-31

采纳的回答： Stephen23

Hi, how I could generate random number 90 times

probability space are 1, 2, 3
totally 90 random numbers
got 21 of 1, 38 of 2 and 31 of 3

Could you give me some solutions?

Thanks Joy

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Stephen23 2017-3-30

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编辑：Stephen23 2017-3-30

在 MATLAB Online 中打开

You could use randperm to randomly arrange a vector of exactly those numbers:

>> vec = [repmat(1,21,1);repmat(2,38,1);repmat(3,31,1)]; % or use REPELEM
>> vec = vec(randperm(numel(vec)));

And checking that it fulfills your requirements:

>> numel(vec)
ans =  90
>> nnz(vec==1)
ans =  21
>> nnz(vec==2)
ans =  38
>> nnz(vec==3)
ans =  31

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Joy 2017-3-31

Thanks lot. It's much better than using a for loop.

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