select random number from a variable

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Anusha
Anusha 2014-1-21
编辑： Andrei Bobrov 2014-1-21
how to select 4 values from already assigned variables
a= [4 5 1 2 9 7 8 1]
select 4 values from a in random fashion

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Andrei Bobrov
Andrei Bobrov 2014-1-21
编辑：Andrei Bobrov 2014-1-21
out = a(randperm(numel(a),4));
or
ii = randperm(numel(a));
out = a(ii(1:4));

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