Fourier Series Expansion of a Periodic Square Wave

I have tried to code and plot the first 50 terms of the given graph; but i constantly failed.

x(t)= 4/pi ( sin(t) + sin(3t)/3 + sin(5t)/5+...+ sin(49t)/49)

[John D'Errico]

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Answer 1

[Torsten]

n = 49;
fun = @(t) 4/pi*sum(sin((1:2:n)*t)./(1:2:n));
T = linspace(0,2*pi,100);
X = arrayfun(fun,T);
plot(T,X)