I am using tutorial frequency domain linear regression but I can't understand some parts.

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uzma Ashraf Ali
uzma Ashraf Ali 2019-10-30
评论： Daniel M 2019-10-30
tsdft = fft(ts-mean(ts));
freq = 0:1/72:1/2;
plot(freq.*12,abs(tsdft(1:length(ts)/2+1)),'o-', ...
'MarkerFaceColor','auto')
xlabel('Cycles/Year')
ylabel('Magnitude')
ax = gca;
ax.XTick = [1/6 1 2 3 4 5 6];
how you calculate freq?
why is multiply by 12?
In graph 1/6 used instead o??
kindly help me in regard
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