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& gt& gtn = 1:50;
x = cos(n *(π/6));
n = 12;
x =零(1,N);
sum = 0;
為了什麽?k=1:N
為了什麽?ii=1:N
sum = sum+x(ii)* exp(-I * 2 * pi * k/N);
結束
x(k)= sum;sum = 0;
stem(ABS(X));
網格?在