Graphing partial sums of harmonic fourier series

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

Answer 1

[Walter Roberson]

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.

Answer 2

[Torsten]

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)