How can I break this while loop and store the data?

Question

Alicia Cuber Caballero 2019-7-31

0
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https://ww2.mathworks.cn/matlabcentral/answers/474230-how-can-i-break-this-while-loop-and-store-the-data

评论： Alicia Cuber Caballero 2019-7-31

Hi! I'm trying to generate a collatz sequence for any n and to stop when n == 1. I used the following:

n=7
while n>1
    if mod(n, 2)==0
        n = n/2
    end
    if mod(n,2)~=0
        n = (3.*n)+1
    end
  
end

I thought it would stop generating when n reached 1, given the conditions for the while loop, but it just doesn't. As a result, it keeps running forever and matlab can't handle it and the site closes. I tried adding

if n==1
    break
end

right after "while n>1" but it doesn't work either. I also want to store the sequence generated (which will vary in size depending on the value of n) and I don't know how to.

Thanks in advance!!

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Answer 1

Alex Mcaulley 2019-7-31

1
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https://ww2.mathworks.cn/matlabcentral/answers/474230-how-can-i-break-this-while-loop-and-store-the-data#answer_385566

在 MATLAB Online 中打开

Try with this:

n = 7;
iter = 1;
seq(1) = n; %where the sequence is stored
while n > 1
    if mod(n, 2)==0
        n = n/2;
    elseif mod(n,2)~=0
        n = (3.*n) + 1;
    end
    iter = iter + 1;
    seq(iter) = n;
end