# Adjusting a Sawtooth Graph and getting spectrum

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S on 24 Feb 2024
Commented: S on 26 Feb 2024
I am trying to graph a traingle wave with a width of 8000pi (4000pi each way from 0) and get its spectrum. This is what I have but can't get figure 1 to look right. I am unsure what I am doing wrong, my best guess would be I need to change either T or the first variable in sawtooth but doing that keeps making it worse so I'm not sure. Thank you for your time!
T = 10*50;
fs = 2000;
t = 0:1/fs:T-1/fs;
x = sawtooth(pi*4000*t,1/2);
figure(1)
plot(t,x)
grid on
figure(2)
pspectrum(x,fs,'Leakage',0.91)

Paul on 25 Feb 2024
Edited: Paul on 25 Feb 2024
Do you want a triangle or a sawtooth? Assuming the former as stated in the question, use tripuls
%T = 10*50;
fs = 2000;
t = -4000*pi:1/fs:4000*pi;
numel(t) % lots of data points
ans = 50265483
x = tripuls(t,pi*8000,0);
figure(1)
plot(t,x)
xline(4000*pi);xline(-4000*pi);
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Paul on 25 Feb 2024
The time vector already spans -4000*pi to 4000*pi. I added some lines to the plot to make that clear.
S on 26 Feb 2024
oh thank you very much!