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.

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Rohan Sabherwal 2020-11-12

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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)

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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

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回答（1 个）

Setsuna Yuuki. 2020-11-13

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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)