# Index exceeds the number of array elements in while loop

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Kaan Uçar on 25 Mar 2019
Commented: Kaan Uçar on 13 Apr 2019
I ve been trying to create a Fibonacci Sequence in which ratio of the adjacent values converge to 0.001. Here is the code I've written so far:
clc
clear
x = input('Please enter the first number in the series:');
y = input('Please enter the second number in the series:');
s(1) = x;
s(2) = y;
k = 3;
while abs(s(k)./s(k-1) - s(k-1)./s(k-2))>0.001
s(k) = s(k-1) + s(k-2)
k = k+1;
end
disp(s)
But when I run the code, it says; Index exceeds the number of array elements (2)
Error is on the eighth line.

Kevin Phung on 25 Mar 2019
there is an error because you have not defined what s(3) is.
Kaan Uçar on 25 Mar 2019
I defined s(3) as x + y and and still get the error. This time in parantheses it says 3 instead of 2.
Kevin Phung on 25 Mar 2019
ok, and where is that in your code? What is see is that you've set s(1) and s(2) to be the user input.
while abs(s(k)./s(k-1) - s(k-1)./s(k-2))>0.001
starts with s(k) which is s(3), and that does not exist.

Raghunandan V on 26 Mar 2019
Hi,
I just shuffled the code a bit. Check this:
clc
clear
x = input('Please enter the first number in the series:');
y = input('Please enter the second number in the series:');
s(1) = x;
s(2) = y;
k = 3;
Cond =1; % intialize the condition
while Cond > 0.001
s(k) = s(k-1) + s(k-2);
Cond = abs(s(k)/s(k-1) - s(k-1)/s(k-2));
k = k+1;
end
disp(s)

#### 1 Comment

Kaan Uçar on 13 Apr 2019
Sorry for the late response. I got the problem fixed. Thank you for your helps.