Randperm without number 1

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Mary Hemler
Mary Hemler 2020-5-14
编辑： Stephen23 2020-5-14
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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Stephen23
Stephen23 2020-5-14
编辑：Stephen23 2020-5-14
r = 1+randperm(N-1,N20);

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