How to randomly select variable from the range of numbers ?

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Karthik KJ
Karthik KJ 2012-10-26
Hi,
I have a variable
a=[1:1:100]
I would like to select from the variable a , 5 values randomnly every time. Eg 10 15 67 89 99.
Is there any way to do it in simple rather than using a for loop.
Appreciate the help

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-26
a=[1:1:100]
out=a(randi(100,1,5))
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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-26
编辑：Azzi Abdelmalek 2012-10-26
in case it can't be repeated
[~,idx]=sort(rand(1,100))
out=a(idx(1:5))

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更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-10-26
编辑：Andrei Bobrov 2012-10-26
a = 1:100;
ii = randperm(numel(a));
out = a(ii(1:5));
or
[ii,ii] = sort(rand(1,numel(a)));
out = a(ii(1:5));
or
out = a(randperm(numel(a),5));
Wayne King
Wayne King 2012-10-26
编辑：Wayne King 2012-10-26
idx = randperm(length(a));
idx = idx(1:5);
a(idx)
or if you have the newest version of MATLAB
idx = randperm(length(a),5);
a(idx)

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