Matlab - program won't stop calculating

Question

Drake 2013-9-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/88133-matlab-program-won-t-stop-calculating

My program I created is using a simple bisection method to calculate a root, but it just keeps running. Any thoughts on how to fix my code to stop this?

myFunction = @(x) 9*(x^4) + 18*(x^3) + 38*(x^2) - 57*x +14;
format long
a = 0; % lower limit
b = 1; % upper limit
c = (a + b) / 2;
while abs(myFunction(c)) > 0.01
    if (myFunction(a)*myFunction(c)) < 0
        a = c;
    else
        b = c;
    end
    c = (a + b) / 2;
end
fprint('The root is %g\n', c)

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Answer 1

Matt J 2013-9-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/88133-matlab-program-won-t-stop-calculating#answer_97722

编辑：Matt J 2013-9-24

在 MATLAB Online 中打开

Install a maximum number of iterations. You should be able to reach 2^(-N) precision in N steps. Additionally,

    if (myFunction(a)*myFunction(c)) < 0
        b = c;
    elseif (myFunction(b)*myFunction(c)) < 0
        a = c;
    else
       ....something  
    end