# How to plot graphs with the specific time domain

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Jinquan Li on 7 Apr 2021
Commented: Star Strider on 8 Apr 2021
Hi, i am trying to plot 3 graphs with the specific time domian. Here's my code:
t = -2*pi:0.01:2*pi;
function y = f(t)
y = (abs(t)./t+1)/2 - 2*((abs(t-pi)./(t-pi)+1)/2) + (abs(t-2*pi)./(t-2*pi)+1)/2;
endfunction
plot(t = 0:2*pi,f(t))
title("f(t)");
plot(t = -2*pi:0,-f(-t))
title("-f(-t)");
plot(t = 0:2*pi,-f(t+pi))
title("-f(t+T)");
Here's the error i got:  Star Strider on 7 Apr 2021
I am not certain what you want to do.
Try this:
figure
subplot(3,1,1)
plot(t((t>=0) & (t<= 2*pi)),f(t((t>=0) & (t<= 2*pi))))
ylim([-1 1])
title("f(t)");
subplot(3,1,2)
plot(t((t>=-2*pi) & (t<=0)),-f(-t((t>=-2*pi) & (t<=0))))
ylim([-1 1])
title("-f(-t)");
subplot(3,1,3)
plot(t((t>=0) & (t<= 2*pi)),-f(t((t>=0) & (t<= 2*pi))+pi))
ylim([-1 1])
title("-f(t+T)");
hold off
Experiment to get the results you want. Remember that changes in the ‘t’ vector as the independent variable must be the same in the argument to ‘f’.
Star Strider on 8 Apr 2021
My pleasure!

R2020b

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