plotting sin wave signal

2017 4 10
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Hi, I have the following signal, f(t) = sin(t), -(pi/2)<= t <= (pi/2), what is the code to plot it for three whole periods? Thank you for the help!

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Jimmy W
Jimmy W 2017-4-10
编辑：Walter Roberson 2017-4-10
Basically I can only see one cycle after I plot it using these codes:
clc
clear all
x = linspace(-pi/2 , pi/2);
y = abs(sin(x));
plot(x,y);

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Walter Roberson
Walter Roberson 2017-4-10

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You defined -(pi/2)<= t <= (pi/2) . Your function does not have a definition outside of that one period, so it is not meaningful to plot it for multiple periods.
You could extend your definition:
x = linspace(-pi/2 , 5*pi/2);

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