my plot won't show graph
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采纳的回答
That's because there's only 1 point and it takes >=2 points to form a line. By default, plot() does not show markers, only lines.
The reason there is only 1 point is because there is only 1 value in t:
t=12:0.01:12
x=sin(t);
plot(t,x, 'o-')
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