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To get a random number

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Muruganandham Subramanian
关闭： MATLAB Answer Bot 2021-8-20
Hi,
Am having a incremental column matrix like, e.g. for 1st iteration, it is 100*1(double), then for 2nd iteration iteration, it will be 100*2(double), etc.. Form this, for 1st iteration, i need to get a random no (single data only). from 1st column of matrix and for 2nd iteration, i have to get a random no. from 2nd column of matrix only.
Thank you in advance!!@!!
  1 个评论
Michael
Michael 2012-1-18
Maybe I misunderstand but to me this question appears contradictory. How is a number random if it depends on your column as an input?

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回答（1 个）

Wayne King
Wayne King 2012-1-18
You can use
x = randperm(100);
randomindex = x(1);
Then, use that index to choose an element from the appropriate column, say your data matrix is X
X(randomindex,1) %choose from first column
X(randomindex,2) %choose from 2nd column
  7 个评论
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Walter Roberson
Walter Roberson 2012-1-20
Sorry, the references to size(X,2) should have been size(X,1)
rchoices = randperm(size(X,1));
randchoice = X(rchoices(1),IterationNumber);
Muruganandham Subramanian
Muruganandham Subramanian 2012-1-20
It's working...
Thanks walter

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