Random numbers without repetition

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joey
joey 2011-3-31
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!
  2 个评论
Jan
Jan 2011-3-31
No rows should have numbers???
joey
joey 2011-3-31
no row shoul not have identical combination of numbers

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Teja Muppirala
Teja Muppirala 2011-3-31
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

更多回答（1 个）

Titus Edelhofer
Titus Edelhofer 2011-3-31
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
  3 个评论
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Jan
Jan 2011-3-31
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
joey 2011-3-31
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

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