Index exceeds the number of array elements in while loop

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Kaan Uçar
Kaan Uçar 2019-3-25
评论： Kaan Uçar 2019-4-13
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.
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Kaan Uçar
Kaan Uçar 2019-3-25
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
Kevin Phung 2019-3-25
编辑：Kevin Phung 2019-3-25
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.

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Raghunandan V
Raghunandan V 2019-3-26
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)

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