select random number from a variable
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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
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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