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How to shuffle some arrays of a matrix?

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alexaa1989
alexaa1989 2014-8-12
回答： Azzi Abdelmalek 2014-8-12
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 个评论
Adam
Adam 2014-8-12
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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回答（5 个）

Adam
Adam 2014-8-12
编辑：Adam 2014-8-12
a = a( randperm( numel(a) ) )
works assuming a is a vector
Andrei Bobrov
Andrei Bobrov 2014-8-12
a=[1 2 3 4 5 6];
n = numel(a);
a(2:n-1) = a(randperm(n-2)+1);
Michael Haderlein
Michael Haderlein 2014-8-12
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 2014-8-12
p = randperm(n)
Azzi Abdelmalek
Azzi Abdelmalek 2014-8-12
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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