Report r_n and n when |r_n − r_n−1|< 10−9 (while-loop).

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LILIA VERGARA
LILIA VERGARA 2023-1-20
回答： Dyuman Joshi 2023-1-20
I was asked to create a while loop for Fibonacci sequence
with initial values: Fn= Fn−1 + Fn−2,
F0 = 2 and F1 = 3
note r_n= Fn+1/Fn
It wants me to report r_n and n when |rn−rn−1|< 10−9 (while-loop)
Code created:
fib_first = 2;
fib_second = 3;
fib_all = zeros(n, 1);
fib_all(2) = fib_first;
fib_all(3) = fib_second;
n=1:100
fib_all(ii) = fib_all(ii-1)+fib_all(ii-2)
while abs(r_n - r_n-1) < 10^-9
end
I am having a hard time understanding what I am doing wrong. I do not feel confident with this code.

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回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-1-20
Ran in:
You have to update the values inside the while loop. One way to do is
F=[2 3 5];
%defining rn = F(n+1)/F(n)
r=F(2:3)./F(1:2);
n=2;
while abs(diff(r))>=1e-9
F=[F(2:3) F(2)+F(3)];
r=F(2:3)./F(1:2);
n=n+1;
end
F
F = 1×3
28657 46368 75025
n
n = 22
rn=r(end)
rn = 1.6180

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