Can not use the Fibonacci built in function

1 次查看（过去 30 天）

显示更早的评论

Hunter Steele 2019-9-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481778-can-not-use-the-fibonacci-built-in-function

编辑： James Tursa 2019-9-24

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... (add previous two numbers together for the next in the sequence)

1. Find the first 10 odd numbers.

2. The First 10 odd numbers are: <Provide all numbers here with a space between each>

7 个评论
显示 5更早的评论隐藏 5更早的评论

Hunter Steele 2019-9-24

n = input('Enter10:');

b(1) = 0;

b(2) = 1;

x = 3;

while x <= n

b(x)=(b(x-1)+b(x-2));

x = x+1;

end

disp('The first 10 values of the Fibonacci are:')

disp(b)

Hunter Steele 2019-9-24

That gives me the numers for the firdt 10 values. I need to know how to get the first 10 odd values.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

James Tursa 2019-9-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481778-can-not-use-the-fibonacci-built-in-function#answer_393209

编辑：James Tursa 2019-9-24

在 MATLAB Online 中打开

For simplicity, let's assume you don't know how many iterations you need in advance. So start with your current code:

while x <= n
    b(x)=(b(x-1)+b(x-2));
    x = x+1;
end

and modify it to keep running until we get 10 odd numbers:

k = 1; % the number of odd numbers we have so far (starts at 1 because b(2) is an odd number)
while true
    b(x)=(b(x-1)+b(x-2));
    if( b(x) is an odd number ) % <-- you need to fill in the actual test for odd number here
        k = k + 1;  % increment the number of odd numbers we have so far
        % do something here with the odd b(x)
        if( k == n ) % if we have enough odd numbers, then break out of loop
            break;
        end
    end
    x = x+1;
end

So, try to fill in that test for the odd number. Then try to think of a way to either print the odd numbers as you go, or save the odd numbers for later printing.