MATLAB: How To Generate Non Repeating Random Numbers from 1 to 49

non-repeatingrandom numbersrandperm

Hi,

Does anybody know how to generate a series of 10 non-repeating random integers between 1 and 49?

So far I've tried using p = randperm(50); p = p(1:10)-1; but this can give me 0 in my series of 10 random integers :/

Thanks

Best Answer

 p = randperm(49);
 p = p(1:10);

Or just

 p = randperm(49,10);

Related Solutions

MATLAB: Non-repeating random integer generator with a seed

According to the doc for randperm, it uses the same random number generator as rand, randi, and randn. So you can control the seeding with rng (even though randperm isn't mentioned in the rng doc). E.g.,

>> rng('default')
>> randperm(10)
ans =
     6     3     7     8     5     1     2     4     9    10
>> randperm(10)
ans =
     6     1     7     4     9     5     8     3    10     2
>> randperm(10)
ans =
     2    10     8     9     1     5     7     6     3     4
>> rng('default')
>> randperm(10)
ans =
     6     3     7     8     5     1     2     4     9    10
>> randperm(10)
ans =
     6     1     7     4     9     5     8     3    10     2
>> randperm(10)
ans =
     2    10     8     9     1     5     7     6     3     4

MATLAB: Random Binary Vectors with 14 ones and 14 zeros

This sound like homework, but since there’s a chance it could be part of a legitimate research problem, this is how I would do it:

M = zeros(50,28);
for k1 = 1:50
    M(k1,randperm(28,14)) = 1;
end
Sample = M(1:5,:)                                   % Look At First Five Rows

The code begins by preallocating the ‘M’ matrix, then assigning random, non-repeating (in the same row vector) 1 values to each row. See the documentation for randperm for details.

Best Answer

Related Solutions

MATLAB: Non-repeating random integer generator with a seed

MATLAB: Random Binary Vectors with 14 ones and 14 zeros

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