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I have the code which generates an array for a1. For N = 10, what does a1 = [a1 a1+N/2] stores.? Is there any need?

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Neha W
Neha W 2016-9-21
关闭： MATLAB Answer Bot 2021-8-20
if mod(N,2)==0 && mod(N,4)~= 0
a1 = 1: (N/2-1);
a1 = a1(gcd(a1,N/2)==1);
a1 = [a1 a1+N/2];
end

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Walter Roberson
Walter Roberson 2016-9-21
a1 = [a1 a1+N/2]
is the same as
a1 = horzcat(a1, a1+N/2);
which is to say, append a1+N/2 on the end of the current a1

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