How to randomly repeat an array elements?

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Ved
Ved on 20 Oct 2013
Commented: Ved on 20 Oct 2013
I have a 1x4 array as,
P = [1, -1, j, -j]
How to form a New " 1x16 random array " using only four elements of 'P' ?
This new 1x16 array should have random arrangement of elements of 'P',(i.e.,irrespective of order of elements of 'P')

Accepted Answer

Jos (10584)
Jos (10584) on 20 Oct 2013
Here is an approach:
P = [1 -1 j -j]
N = 16 ;
ix = ceil(numel(P)*rand(1,N)) % random indices into P
Y = P(ix)
If you have access to RANDI, you could use that function as well.
If you want to have each element of P repeated four times, but all in random order, try this:
Y = repmat(P,1,4)
Y = Y(randperm(numel(Y)))
  1 Comment
Ved
Ved on 20 Oct 2013
@Jos(10584): Thank you very much.

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More Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 20 Oct 2013
P = [1, -1, j, -j];
a=perms(1:4);
id=randi(size(a,1),4,1);
idx=a(id,:);
out=P(idx(:))'

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