how to randomly choose some values from specific variable

2015 6 15
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更新时间：2015 6 15
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consider a=[6 5 4 3 6 4 2 1]
i want some values from variable 'a' say[4 3 2]or 20% of variable a

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回答（1 个）

James Tursa
James Tursa 2015-6-15
编辑：James Tursa 2015-6-15

1 个投票

E.g., if you want only a subset of your vector:
k = number of values you want; % Must be <= numel(a)
p = randperm(numel(a),k);
b = a(p);
If you want a sample that could include repeats, e.g.,
k = number of values you want;
p = randi(numel(a),1,k);
b = a(p);

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muhammad ismat
muhammad ismat 2015-6-15
编辑：Image Analyst 2015-6-15
also
values=s(end,randperm(size(s,2), 3)
thank you very much
Image Analyst
Image Analyst 2015-6-15
OK -- you didn't say anything about "s" or a 2D matrix, but I think you should mark it "Accepted" anyway, to give James reputation points.

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