How to randomly repeat an array elements?

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')

Answer 1

[Jos (10584)]

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)))

[Ved]

@Jos(10584): Thank you very much.

Answer 2

[Azzi Abdelmalek]

P = [1, -1, j, -j];
a=perms(1:4);
id=randi(size(a,1),4,1);
idx=a(id,:);
out=P(idx(:))'

[Ved]

@Azzi: Thank you very much.