How to shuffle some arrays of a matrix?

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alexaa1989
alexaa1989 on 12 Aug 2014
Answered: Azzi Abdelmalek on 12 Aug 2014
Hi Does any one know how can I randomly shuffle some arrays in a matrix? for example
a=[1 2 3 4 5 6]
I need to choose from for example 2 to 5 and shuffle them like this
a=[1 5 4 2 3 6]
  1 Comment
Adam
Adam on 12 Aug 2014
Do you mean you need to choose index positions 2 to 5 or actual numbers 2 to 5? Or is your start array always just a sorted contiguous sequence so they amount to the same thing?

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Answers (5)

Adam
Adam on 12 Aug 2014
Edited: Adam on 12 Aug 2014
a = a( randperm( numel(a) ) )
works assuming a is a vector
Andrei Bobrov
Andrei Bobrov on 12 Aug 2014
a=[1 2 3 4 5 6];
n = numel(a);
a(2:n-1) = a(randperm(n-2)+1);
Michael Haderlein
Michael Haderlein on 12 Aug 2014
x=rand(1,6);
[~,y]=sort(x);
a(y)
If a is always just 1:6, you can directly use y instead.
Ahmet Cecen
Ahmet Cecen on 12 Aug 2014
p = randperm(n)
Azzi Abdelmalek
Azzi Abdelmalek on 12 Aug 2014
a=[1 2 3 4 5 6]
n=2:5
idx=randperm(n(end)-n(1)+1)+n(1)-1
a(n)=a(idx)

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