How to shuffle some arrays of a matrix?

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]

[Adam]

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?

Answer 1

[Adam]

a = a( randperm( numel(a) ) )

works assuming a is a vector

Answer 2

[Andrei Bobrov]

a=[1 2 3 4 5 6];

n = numel(a);
a(2:n-1) = a(randperm(n-2)+1);

Answer 3

[Michael Haderlein]

x=rand(1,6);
[~,y]=sort(x);
a(y)

If a is always just 1:6, you can directly use y instead.

Answer 4

[Ahmet Cecen]

 p = randperm(n)

Answer 5

[Azzi Abdelmalek]

a=[1 2 3 4 5 6]
n=2:5
idx=randperm(n(end)-n(1)+1)+n(1)-1
a(n)=a(idx)