how select random elements of array without replacement
6 views (last 30 days)
Show older comments
I have a matrix A(1*N).[a11 a12 a13 a14 a15 a16 a17 .....] first,I want to select random m1 member of A without replacement .then I want to select m2 member without replacement that don't select befor step. and I want that don't select a14 in any step. can anybody help me to write matlab code of it?
Accepted Answer
Stephen23
on 5 Jul 2016
Edited: Stephen23
on 5 Jul 2016
The easiest way to do this is to use randperm: this provides a random selection without replacement. Note that randi uses replacement, so is not useful for your task.
Something like this:
>> A = 1:23;
>> excl = 4; % indices to exclude
>> B = A(~ismember(1:numel(A),excl));
>> idx = randperm(numel(B));
Where B contains all values of A except the elements at locations given in excl, and idx contains random indices without replacement for every element in B. Thus you can easily use these indices in a loop:
for k = 1:numel(B)
B(idx(k))
end
More Answers (0)
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!