How do I ensure the user inputs a minimum x value that's actually smaller than the maximum x value?

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Alexis Williams 2021-4-18

0
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https://ww2.mathworks.cn/matlabcentral/answers/805811-how-do-i-ensure-the-user-inputs-a-minimum-x-value-that-s-actually-smaller-than-the-maximum-x-value

评论： Alexis Williams 2021-4-18

I am trying to get the user's minimum and maximum x values for the quadratic equation, but I don't know how to code to make sure that the minimum value doesn't equal or exceed the maximum value. Please help.

% Plotting a User-Entered Quadratic Function %
user_input = input(['Enter a, b, and c values for the quadratic equation',...
    '\nax^2 + bx + c = 0. Input all three values in this form [a b c].',...
    '\nInput values (including brackets): ']);
user_input1 = input(['Enter the minimum and maximum values of x in',...
    '\nthe form [a b]: ']);

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Answer 1

David Fletcher 2021-4-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/805811-how-do-i-ensure-the-user-inputs-a-minimum-x-value-that-s-actually-smaller-than-the-maximum-x-value#answer_678251

在 MATLAB Online 中打开

isError = 1;
while isError
    user_input1 = input(['Enter the minimum and maximum values of x in',...
        '\nthe form [a b]: ']);
    isError = ~(user_input1(1)<user_input1(2));
end