Index exceeds the number of array elements in while loop

Question

Kaan Uçar 2019-3-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/452315-index-exceeds-the-number-of-array-elements-in-while-loop

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 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 2019-3-25

编辑：Kevin Phung 2019-3-25

在 MATLAB Online 中打开

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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Answer 1

Raghunandan V 2019-3-26

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/452315-index-exceeds-the-number-of-array-elements-in-while-loop#answer_367430

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)