How can I plot this Fourier series in a for loop?

I am trying to plot the sine from of a fourier series using the pre-determined equations/ values for A0, Ak, and Bk. I cannot figure out how to plot the fourier series. I keep getting errors where I noted "ERROR POINT" saying "Unrecognized function or variable 't'." I'm not sure why or how to fix it, as everything I have tried, including plotting outside of the for loop and implementing another for loop for the t/ time variable, results in nothing being plotted. Any help would be much appreciated!!

A0 = 1.4;
x = A0/2;                                   %initializing value of x for k = 0

for k=1:100
    Ak = (1/(k*pi))*sin(7*k*pi/5);          %hand calculated equation
    
    Bk = -(1/(k*pi))*(cos(7*k*pi/5)-1);     %hand calculated equation
    
    Mk = sqrt(Ak^2+Bk^2);
    psi_k = atan(Ak/Bk);
    
    x = x + Mk*sin(k*t*pi/5 + psi_k);       %ERROR POINT, sine form of fourier series
    plot(t,x);
    
end

Answer 1

[Alexander]

t is not defined.

[Allie Ludovice]

How do I define it so it isn't just a constant? I need t to be the variable on the x axis of the plot.

[Alexander]

I don't know if the computation makes sense but it runs w/o error:

A0 = 1.4;
xs = A0/2;                                   %initializing value of x for k = 0
t = 1:100;
for k=1:100
    Ak = (1/(k*pi))*sin(7*k*pi/5);          %hand calculated equation
    Bk = -(1/(k*pi))*(cos(7*k*pi/5)-1);     %hand calculated equation
    Mk = sqrt(Ak^2+Bk^2);
    psi_k = atan(Ak/Bk);
    x(k) = xs + Mk*sin(k*t(k)*pi/5 + psi_k);      %former ERROR POINT, sine form of fourier series
    xs = x(k);
end
plot(t,x)

Hopefully it helps.