how to randomly choose some values from specific variable

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

Answer 1

[James Tursa]

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);

[muhammad ismat]

also

values=s(end,randperm(size(s,2), 3)

thank you very much

[Image Analyst]

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.