How to create a random data set from the possible values?

1 view (last 30 days)
I have eleven inputs, each input have several values. How can I create five hundred distinct sets of variables at random from the possible input values. (like following image)

Accepted Answer

Walter Roberson
Walter Roberson on 14 Apr 2016
pops = {500:500:5000, .3:.05:.6, .5:.5:2.5, .5:.1:1, 200:100:500, 2:6, 4000:1000:8000, 100:100:1000, 2:1:8, 5:2.5:15, 30:10:70};
popL = cellfun(@length, pops(:).');
npop = length(pops);
N = 500;
popidx = floor(rand(N,npop) .* repmat(popL, N, 1))+1;
samps = cell2mat(arrayfun(@(IDX) pops{IDX}(popidx(:,IDX)).', 1:npop, 'Uniform', 0));
And now samps is a 500 x 11 array in which column K is uniformly randomly selected from pops{K}
Walter Roberson
Walter Roberson on 14 Apr 2016
Yes, that is good too.
For whatever reason I figured it would be a good idea to calculate all of the indexes at the same time.

Sign in to comment.

More Answers (1)

Roger Stafford
Roger Stafford on 14 Apr 2016
Let L be a column vector with eleven integers, each the count of the number of possible values in the corresponding set of the eleven sets.
L = [10;7;5;6;4;5;5;10;7;5;5]; % The number of possibilities in each set
I = ceil(L.*rand(11,1)); % I has random indices for each set
The vector I will then have random indices that can select one out of each of the sets of values you have listed.


Find more on Data Type Conversion in Help Center and File Exchange


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by