Fourier sine series plotting first term, first five term, and first 15 terms on one graph

I need help plotting only the first terms of my fourier sine series, then the first five terms, and the first fifteen terms on one graph. This is my code thus far:

x = 0:0.1:25;
n = 10;
ysin = fsin(x,n);
plot(x,ysin),grid
xlabel('x'),ylabel('sin function')


% Define functions

function f = fsin(x,n)
         
         f = zeros(1,numel(x));
         f = 2;
         for i = 1:n
             an = -4*(cos(i*pi/2)-1)/(i*pi);
             f = f + an*sin(i*pi*x/50);
         end

end

For reference my series is . I made L = 50 and my sum is running from n=1 to infinity.

Answer 1

[Walter Roberson]

x = 0:0.1:25;

n = 1;
ysin = fsin(x,n);
plot(x,ysin)
hold on

n = 5;
ysin = fsin(x,n);
plot(x,ysin)
hold on

n = 15;
ysin = fsin(x,n);
plot(x,ysin)
hold on

grid on
xlabel('x')
ylabel('sin function')
hold off

% Define functions

function f = fsin(x,n)
         
         f = zeros(1,numel(x));
         f = 2;
         for i = 1:n
             an = -4*(cos(i*pi/2)-1)/(i*pi);
             f = f + an*sin(i*pi*x/50);
         end

end

[Katie Beeler]

Thank you for your help!