Return row vector adding on to the end

Question

Dominic 2022-11-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1846658-return-row-vector-adding-on-to-the-end

编辑： Voss 2022-11-15

采纳的回答： Voss

Trying to make the sequence show the values till the specified spot but idk how to return as a vector

IE if we say myFibon(4) the anwser is 5 but i want to show all the values from that sequence till 5

here is my code and description so far.

% Function Declaration:

function [result] = myFibon(x)

%% The Fibonacci numbers are generated by the sequence

% What does the sequence look like? 1,1,2,3,5,8,13

% Can you work out what the next term is?

%

% 1 + 1 = 2

% 1 + 2 = 3

% 2 + 3 = 5

% 3 + 5 = 8

% 5 + 8 = 13

%

% Write a recursive function to compute the Fibonacci numbers

% F0 up and through to Fx, where "x" was specified as

% an input parameter.

%

%% Use the Fibonacci relationship

% Given that F0=F1=1

% Fn = Fn−1 + Fn−2

% Return the "result" as a row vector of the Fibonacci sequence.

% Submit your function

result = [1,1];

if x > 1

result = myFibon(x - 1) + myFibon(x - 2);

result(end + 1) = result;

else

result = 1;

end

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Answer 1

Voss 2022-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/1846658-return-row-vector-adding-on-to-the-end#answer_1095693

在 MATLAB Online 中打开

myFibon(4)
ans = 1×5
     1     1     2     3     5
function seq = myFibon(x,seq)
if nargin < 2
    seq = [];
end
if x > 1
    temp1 = myFibon(x-1,seq);
    temp2 = myFibon(x-2,seq);
    seq = [temp1 temp1(end)+temp2(end)];
elseif x == 1
    seq = [1 1];
else
    seq = 1;
end
end

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Dominic 2022-11-13

This helped a lot thanks so much! Is nargin necessary still new to matlab and I’m awful at it and any advice on how to improve

Voss 2022-11-15

编辑：Voss 2022-11-15

在 MATLAB Online 中打开

nargin is not strictly necessary, but it's convenient. It's there so that you can call myFibon with one argument only. That is, you don't have to specify the empty sequence when you call it; it does that for you.

function seq = myFibon(x,seq) % x: number, seq: sequence
if nargin < 2 % if no sequence is given
    seq = []; % use the empty sequence
end

[ Notice that any time myFibon is called recursively (i.e., called from within myFibon), it is called with two inputs (i.e., including the sequence). This is key to building the Fibonacci sequence recursively, in this implementation. ]

Allowing one-input call is just so that you can say

myFibon(4)

and not have to say

myFibon(4,[])

That's it.

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Return row vector adding on to the end

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Return row vector adding on to the end

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