Attempted to access x(1,53); index out of bounds because size(x)=[1,2].

Why do i get this error?

i
clear
clc
n=zeros(52,60001);
N=51;
d=0.4;
A=0.15;
B=1.6;
fo=0.05;
e=2*pi*rand(1,51); %epsilon
j=1;
for i=1:N;
  f(i)=(1.1^i)*fo;
  T(i)=1/f(i);
  k(i)=2*pi/dispersion(T(i),d);
  eta(i)=0.5*(1+(2*k(i)*d/sinh(2*k(i)*d)));
  ph(i)=(1/2*n(i))*tanh(k(i)*d)^2;
  a(i)=(0.2*f(i)*(0.205*A^2*B^-4*f(i)^-5*exp(-0.75*(B*f(i)^-4))*ph(i)))^0.5;
end
for t=0:0.005:300
  x(j,1)=t;    
for i=1:50;     
  x(j,i+1)=a(i)*cos(2*pi*f(i)*t+e(i));
  x(j,N+2)=x(j,N+2)+x(j,i+1);
end
j=j+1;
end
plot(x(:,1),x(:,N+2))

Answer 1

[James Tursa]

Type the following at the MATLAB command prompt:

dbstop if error

Then run your code. When the error occurs, the program will pause with all current variables intact. Examine them to see what the sizes are, then backtrack through your code to figure out why the sizes are not what you expect.