why i'm getting this error?

why i'm getting Vectors must be the same length? for an and bn. can someone explain the error also? i always make this mistake

samples = 500;
T = 5;
f0 = 1/T;
t = 0:(1/(samples*f0)):T; % 5 cycles
s = exp((10 - t) / 2);

n = 1:3;

N = 5;
s = repmat(s, [1 N]);
t = 0:(1/(samples*f0)):N*T;
figure()
hold on
plot(t, s)
grid on

a0 = (1/T) * sum(s);
an = (2/T) * s * cos(2*pi*f0*n*t);
bn = (2/T) * s * sin(2*pi*f0*n*t);

thanks

[KSSV]

s = s(1:length(t)) ;

Answer 1

[Prajith Chilummula]

Hi ocsse,

The line below produces a vector of size 501.

t = 0:(1/(samples*f0)):T;

repmat repeats the 1X501 matrix 5 times along the row making it 1X2505 size vector.So s has 1X2505 dimension.

s = repmat(s, [1 N]);

The line below produces a vector of dimension 1X2501.

t = 0:(1/(samples*f0)):N*T;

So there is mismatch in sizes of s and t.Therefore you get the error mentioned.