Index exceeds the number of array elements in while loop

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]

there is an error because you have not defined what s(3) is.

[Kaan Uçar]

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]

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.

Youve made k a constant 3, and your while loop CONDITION:

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.

Answer 1

[Raghunandan V]

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)

[Kaan Uçar]

Sorry for the late response. I got the problem fixed. Thank you for your helps.