Hello, I am trying to plot the fourier series of a function but it doesnt seem to be giving me anything near the graph of the original fuction.

2 次查看（过去 30 天）

Rohan Sabherwal 2020-11-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/646333-hello-i-am-trying-to-plot-the-fourier-series-of-a-function-but-it-doesnt-seem-to-be-giving-me-anyth

回答： Setsuna Yuuki. 2020-11-13

t = -pi: 0.0001 : pi
total = 0.5
for n = 1:1:100
    an = -1*((-1)^n)+1 /pi*((n)^2);
    bn = -exp(1)*n*((-1)^n) - pi*n*((-1)^n) + 4*n*((-1)^n) - (4*n) + (exp(1)*n) /pi*n^2;
    total = total + an*cos(n*t) + bn*sin(n*t); 
end 
a0 = (-pi/2)+4+exp(1);
total = total*a0;
plot(t,total)

3 个评论
显示 1更早的评论隐藏 1更早的评论

Rohan Sabherwal 2020-11-12

I have tried to change it but keep getting something completely off, I tried looking over my working out for the fourier series and it seems to be okay.

Bjorn Gustavsson 2020-11-13

Calculate and save the Fourier coefficient for all n and plot them - that way you can check that they behave in the way you expect/intend.

HTH

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Setsuna Yuuki. 2020-11-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/646333-hello-i-am-trying-to-plot-the-fourier-series-of-a-function-but-it-doesnt-seem-to-be-giving-me-anyth#answer_543443

在 MATLAB Online 中打开

What is the waveform it is supposed to give? Did you try a simpler function?

I tried with this code: (Sawtooth wave)

t= 0:1e-3:5;
sumatoria = 0;
serie = 0;
    for n = 1:1:15
            serie=1/pi*1/n*sin(2*n*pi*t);
            sumatoria = serie+sumatoria;
    end
        sumatoria = 1/2-sumatoria;
        plot(t,sumatoria)