creating matrix of unique integeres

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Nabin SUNAM 2015-2-18

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编辑： Stephen23 2015-2-18

I need to create a matrix of size 2*6, with elements as the integers from 1 through 12. None of these integers can repeat. I tried the following way. Is there some other way to do it with the use of loop instead of using randperm function?

clear all

vec = zeros(6,2);

vec1 = randperm(12);

for i = 1:12

vec(i) = vec1(i);

end

disp(vec)

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Geoff Hayes 2015-2-18

Nabin - what is wrong with using randperm? Is it because the output is not a 2x6 matrix? If test is the case, then use reshape to change the twelve element array output of randperm to a 2x6 matrix.

Nabin SUNAM 2015-2-18

It is 2x6 matrix. I'm just curious if it can be done without any built in function.

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Answer 1

Image Analyst 2015-2-18

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You don't need to use randperm at all. Here's a way that uses loops and meets all your criteria:

k = 1;
for col = 1 : 6
  for row = 1 : 2
    vec(row, col) = k;
    k = k + 1;
  end
end

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Nabin SUNAM 2015-2-18

Sorry I didn't mention one important stuff in the question. Those elements can't be in order. They need to look like they were picked randomly - only 1 through 12, but in random order.