Given a vector, I would like to sample without replacement elements from it repeatedly.

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Cem Gormezano
Cem Gormezano 2020-8-21
评论： Matt J 2020-8-21
Given a (m x 1) vector v , I would like to ,randomly without replacement, sample s elements from it. I know I can use randsample(v,s) if I were to do this once. However, I want to do this repeatedly without using a for loop (i.e vectorization) so that it is fast.
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Matt J
Matt J 2020-8-21
编辑：Matt J 2020-8-21
However, I want to do this repeatedly without using a for loop
If you make s>1, you will receive more than one selected sample. It will give you s samples in a single call.

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Matt J
Matt J 2020-8-21
m=10; n=15; s=3;
V=rand(m,n); %hypothetical data
[~,ids] = sort( rand(size(V)) ,1);
ids=ids(1:s,:)+m*(0:n-1);
selection=V(ids) %selects s elements from each column of V
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Bruno Luong
Bruno Luong 2020-8-21
编辑：Bruno Luong 2020-8-21
v = 'a':'z' % your vector
n = 10; % number of "loop"
s = 3; % number of drawing without replacement
[~,ir] = maxk(rand(n,length(v)),s,2);
r = v(ir)

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