Fibonacci function displaying issues

Question

Ashlee 2012-10-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/51254-fibonacci-function-displaying-issues

I created a function for a fibonacci number. I want it to display the largest fibonacci number that is less than or equal to the input. I currently have it set up to run and it will display the last number in the series. Any suggestions as to getting it to display the largest number less than or equal to n?

function f=lastfibonacci(n)
% Returns the largest fibonacci number that is less than or equal to n.
if n<=1;
    f=1;
else
    f=(lastfibonacci(n-1)+lastfibonacci(n-2));
end
end

Wanting:

Ex.: lastfibonacci(7)
ans= 5

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Answer 1

Matt Fig 2012-10-19

0
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https://ww2.mathworks.cn/matlabcentral/answers/51254-fibonacci-function-displaying-issues#answer_62480

在 MATLAB Online 中打开

If you choose to use recursion, you will have quite some time with this. I think it is better to use iteration, myself.

function F3 = lastfibonacci(n)
% Help, and need to check for n<1.
F1 = 1;
F2 = 1;
while F2<=n
    F3 = F2;
    F2 = F2 + F1; % The Fib number.
    F1 = F3;
end