Fourier series sawtooth wave

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Paul Velasco
Paul Velasco 2019-11-13
编辑： randerss simil 2021-2-16
Im trying to create a sawtooth wave but the code i have gives me a square wave. Not sure what i need to change, maybe my values for ap and bp? Sorry im not very good at matlab. Thanks in advance.
T=input('what is the period');
p=input('how many coefficients');
t=linspace(0,3*T,100);
N=10;
bp=sin(80)/320 - cos(80)/4;
ap=sin(80)/4 - sin(40)^2/160;
sum=0;
for p=1:N
Sum=(Sum+(N*ap*cos(2*pi*p*t/T))+(N*bp*sin(2*pi*p*t/T)));
end
F=Sum;
figure(1);
plot(t,F);
  2 个评论
Paul Velasco
Paul Velasco 2019-11-13
These are the equations i have, they dont give me a sawtooth graph
syms t T p
T=input('what is the period');
p=input('how many coefficients');
y=10;
f=t/(2*T);
global ap bp
ap=(2/T).*int((f.*cos(p*2*pi*t/T)),t,0,T);
bp=(2/T).*int((f.*sin(p*2*pi*t/T)),t,0,T);

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回答（2 个）

Urmila Rajpurohith
Urmila Rajpurohith 2019-11-15
You can use “sawtooth” function in MATLAB to create a sawtooth wave.
You can refer to below documentation for more information on “sawtooth” function.
https://www.mathworks.com/help/signal/ref/sawtooth.html
you can also have a look at the similar question:
https://www.mathworks.com/matlabcentral/answers/165393-need-help-to-plot-sawtooth-wave-matlab?s_tid=answers_rc1-2_p2_Topic
randerss simil
randerss simil 2021-2-16
编辑：randerss simil 2021-2-16
T=input('what is the period');
p=input('how many coefficients');
t=linspace(0,3*T,100);
N=10;
bp=sin(90)/90 - cos(0);
ap=sin(90) - sin(45)^2/90;
xsum=0; % avoid standard matlab functions e.g. sum
for p=1:N
xsum=(xsum+(N*ap*cos(2*pi*p.*t/T))+(N*bp*sin(2*pi*p.*t/T))); % use dot for indexing element wise multiplication
end
F=xsum;
figure(1);
plot(t,F);
  1 个评论
randerss simil
randerss simil 2021-2-16
编辑：randerss simil 2021-2-16
Try the above , may be you have to adjust values for bp and ip to get accurate sawtooth waves

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