MATLAB: HOW I COULD DRAW THIS FUNCTION

Question

Answer 1

final answer by myself!!

x=linspace(-5,5,1000);

s=0;

for n=1:1:10000

p=((-1)^(n+1)*sin(n*pi*x))/n;

s=s+p;

end

f=(2/pi)*s;

plot(x,f)