Graphing partial sums of harmonic fourier series

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Hi,everyone. So I have calculated by hand the sine and cousine fourier series in summation form. I was asked to plot the partial sum up to the fifth harmonic of the fourier cosine representation for x=-2 to 4 but I am ensure of how to do it. The cut off line of code is just the equation inside the summation

Answers (2)

Walter Roberson
Walter Roberson on 1 Oct 2022
Use
x = linspace(-2, 4, 200);
Currently you are using x = [-2, -1, 0, 1, 2, 3, 4] which is not enough to get a decent graph.

Torsten
Torsten on 1 Oct 2022
x = (linspace(-2,4,200)).';
n = 1:5;
f = 1 - exp(-1) + 2*sum((1-(-1).^n*exp(-1))./(1+n.^2*pi^2).*cos(n.*pi.*x),2);
plot(x,f)

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