How to create a set of random numbers

Hi, how I could generate random number 90 times

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

Could you give me some solutions?

Thanks Joy

Answer 1

[Stephen23]

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

[Joy]

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