How can I fix this infinite loop?

Question

Gavin Thompson 2021-10-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1469331-how-can-i-fix-this-infinite-loop

评论： Gavin Thompson 2021-10-8

C = input('Enter a vector of coefficients for an odd-order polynomial: ');
valC = length(C);
count = 1;
while mod(valC,2) == 1
    C = input('Try Again. Enter a vector of coefficients for an odd-order polynomial: ');
    count = count + 1;
    if count > 4
        warning('Odd number of coefficients entered. Last element of user input removed.');
        C(:,end) = [];
    end
end

When the count variable reaches 5 I just want to produce the warning and remove the last number from the C array but when I run it, MATLAB produces the warning and removes the variable however it just starts the loop over again instead of ending after the last number in C array is removed.

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Answer 1

Walter Roberson 2021-10-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1469331-how-can-i-fix-this-infinite-loop#answer_803986

在 MATLAB Online 中打开

C = input('Enter a vector of coefficients for an odd-order polynomial: ');
count = 1;
while mod(numel(C),2) == 1
    C = input('Try Again. Enter a vector of coefficients for an odd-order polynomial: ');
    count = count + 1;
    if count > 4
        warning('Odd number of coefficients entered. Last element of user input removed.');
        C(end) = [];
        break;
    end
end

Question: what do you want to do if the user enters the empty array -- such as if they just press return.

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Gavin Thompson 2021-10-8

Good question, I don't think it'll be necessary to code that in right now but I think I know of a few ways I could code that possibility into my program if needed. Thank you for your insight!

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