How to generate random vectors from given set of values?

I have 30 different values. I want to generate possible maximum number of 3*1 vectors from those values with condition that two vectors don't have all same values. How i can store those generated vectors as data list in MATLAB? I need a function which takes 3*1 vector as an input and check whether this vector is exists in data list. If not then add it to data list, otherwise ignore it. What should i do ?

Thanks in advance for your help.

Answer 1

[KL]

use randsample.

https://de.mathworks.com/help/stats/randsample.html

 your_data = rand(30,1);
 random_indices = randsample(numel(your_data),3);
 your_random_mix = your_data(random_indices,random_indices);

To store different outcomes, well, it's only possible to generate 10 different combinations. Why not store them in a 3x10 matrix?

To make sure you get new samples everytime, exclude the elements you have already sampled and create a smaller your_data, sample the new 3 numbers from here.

Another suggestion is to shuffle the elements of your data and reshape it to 3x10. For example,

 your_data = your_data(randperm(numel(your_data)));
 your_samples = reshape(your_data,3,[]);