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I am using randperm to select positions that will be changed. How can I change my code so that the number 1 (position 1) is not included?
N = 50;
N20 = .2*N;
r = randperm(N,N20); %positions that are about to be changed
for y=r
S20a(:,y)=2*round(rand(1)) - 1;
end

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