Random numbers without repetition

X=1 2 3 4 5 6 7 8 9 10

Y=[1 3 4;1 6 9;6 7 8] o Y=[1 3 5;6 8 6;1 5 3] x Like this numbers of each row should be generated randomly with no repetition And no rows should have numbers

Help!

[Jan]

No rows should have numbers???

[joey]

no row shoul not have identical combination of numbers

Answer 1

[Teja Muppirala]

This is a simple (but inefficent) way to do it using UNIQUE:

Y = [];
while size(Y,1) ~= 3
  Y = unique([Y ; randsample(10,3)'],'rows');
end;

Y = Y(randperm(size(Y,1)),:)  %<-- To remove the sorting done by UNIQUE

Answer 2

[Titus Edelhofer]

Hi Joey, not really elegant, but could work (as long as your "real" need is not much larger):

Y = zeros(3, 10);

for i=1:3

    Y(i,:) = randperm(10);
end

Y = Y(:, 1:3);

Titus

[joey]

Thanks for your help but yours does make rows that have same combination of numbers

[Jan]

Does your example "Y=[1 3 5;6 8 6;1 5 3]" have "the same combination of numbers" also? Please explain all of the wanted constraints exactly - it is impossible to guess, what you need.

[joey]

Y=[1 3 4;1 6 9;6 7 8] ok

Y=[1 3 5;6 8 6;1 5 3] not okay

These are examples of 'ok' and 'not okay'

Each row should have number without repetition (I can do it with randsample(10,3))

Also Each row shoul not have identical combination of numbers