Index exceeds problem in line 19

clear all
close all
Nn=60;
Tn=0.5*10^-3;
B0=1*10^3;
Lambda=50; %(50,100)
Cn=10:40:300;
for i = 1:20
for n=1:20
%Dr(n)=Lambda*testQ;
Q1=Nn*Tn*B0*Cn(i)-Lambda+(log(Nn*Tn*B0))/2
Q2= log10(exp(1))*sqrt(Nn*Tn*B0)
Qf= qfunc(Q1/Q2)
Dr(n)=Lambda*(1- Qf)/(Nn*B0);
end
Dr_s(i)=sum(Dr(n));
end
figure;
plot(Cn,Dr_s)
grid on

I have a problem in line 19 with Q1, the message is index exceeds the number of array elements (8). can anyone help me with that.

Answer 1

[DGM]

It means exactly what it says. You've defined Cn as a 1x8 vector, then you are trying to reference its i-th element, where i is an index from 1-20. Cn does not have any more than 8 elements.

Answer 2

[darova]

Cn uses index i

i loops through 1:20, but Cn has only 8 elements