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how to randomly choose some values from specific variable

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muhammad ismat
muhammad ismat 2015-6-15
评论： Image Analyst 2015-6-15
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
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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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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