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Please help me make this function periodic

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Vinh Le
Vinh Le 2019-2-17
回答： Bjorn Gustavsson 2019-2-27
Thank you very much for all the help!
T = 1 millisecond
Vm = 1 volt (amplitude voltage)
t = linspace(-T, 2*T, 3001)
The following pararameter is given
v(t) = Vm - (Vm/T)t for 0<= t <= T
0 elsewhere
I need to modify the vector v so that is represents a periodic function with a period T over this time period
(hint: it should look like a sawtooth), and plot v vs t over the range from -T to 2T.
So far I have this:
T = 1;
Vm = 1;
t = linspace(-T,2*T,3001);
for i = 1:length(t)
if (t(i) >= 0) && (t(i) <= T)
v(i) = Vm - (Vm/T)*t(i);
else
v(i) = 0;
end
end
plot(t,v)

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回答（2 个）

Agnish Dutta
Agnish Dutta 2019-2-27
You can repeat copies of an array along any dimension using the 'repmat()' function. This will allow you to generate a periodic function. The following link contains the documentation for the same:
https://www.mathworks.com/help/matlab/ref/repmat.html
In addition, refer to the following MATLAB answer link which has a query of the same nature as the one you've asked. Go through the accepted answer.
https://www.mathworks.com/matlabcentral/answers/163582-how-to-plot-a-piecewise-periodic-function-please-help
Bjorn Gustavsson
Bjorn Gustavsson 2019-2-27
Write a function for that pulse shape, then have a look at the pulstran function.
HTH

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