help n=12 for I=1:n p(I) =rand p(I) =28×p(I) p(I)=ceil(p(I)) end I need to put constraint on this code must be theres no redanandnt values ..so if n=28 p will be all the numbers from 1:28 but in random

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maha ismail 2015-2-10

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 n=12 
for I=1:n  
p(I) =rand
p(I) =28×p(I) 
p(I)=ceil(p(I))
end 
I need to put constraint on this code must be theres no redanandnt values ..so if n=28 p will be all the numbers from 1:28  but in random

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Adam 2015-2-10

Please keep code in the body of the question not in the title. The title should be a short description of the problem.

Also please use the {} Code block to include formatted code.

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Star Strider 2015-2-10

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‘I need to put constraint on this code must be theres no redanandnt values ..so if n=28 p will be all the numbers from 1:28 but in random’

The easiest way is to use the randperm function:

n = 12;
p = randperm(n);

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Star Strider 2015-2-10

@Adam — Thank you for your Comment!

Our friendly randperm appears frequently in Answers. That’s how I learned about it, since I don’t otherwise need to use it that often.

Star Strider 2015-2-10

@maha ismail — If you don’t have randperm, use Matt Fig’s File Exchange contribution COMBINATOR.

Adam 2015-2-10

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Something like this would work:

nums = 1:28;
n = 28;
p = zeros(1,n);
count = numel( nums );
for i = 1:n
  idx = randi(count);
  p(i) = nums( idx );
  nums( idx ) = [];
  count = count - 1;
end

Not necessarily the most efficient way of doing it, but it will guarantee uniqueness so long as n is at most 28 (or whatever value you set as the maximum of nums.

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maha ismail 2015-2-10

my matlab is version 6.5 doesn't not have randi or randperm instructions ..I have only rand code can you rewrite the same program but with rand instruction?