What is wrong with my code for the bisection method?

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Britney 2014-10-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157735-what-is-wrong-with-my-code-for-the-bisection-method

编辑： Britney 2014-10-8

x=my_bisect(@(x)x-2.5).*exp(-0.5*(x-2).^2)+0.2;[-1,0],1e-5)
a=I(-1);
b=I(0);
msg=sprintf('invalid choice of interval');
       
    if f(a)*f(b)>0
        disp(msg)
        m=[(a+b)/2];
        return
    end

Can I just write my function in x=... above as is or do I have to have it saved in another .m file?

My syntax above is x = my_bisect(f,I,tol)

The error message that comes up is: Error: Unbalanced or unexpected parenthesis or bracket.

edit 1: changed my typo. Thanks Image Analyst.

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Answer 1

Image Analyst 2014-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/157735-what-is-wrong-with-my-code-for-the-bisection-method#answer_154306

min_bisect() is different than my_bisect(). Did you make a typo?

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Image Analyst 2014-10-8

And it barely looks anything like the corrected anonymous function I gave you in http://www.mathworks.com/matlabcentral/answers/157702#answer_154243

Britney 2014-10-8

Thank you for replying.

I'm doing a school task and I need to make a function that calculates f(x) on an interval [-1,0] where f(a)*f(b) changes sign and a given accuracy of the answer. So I started with making this code. The purpose of this code is to make a error message when f is not changing sign in the interval.

I'm new to Matlab. And yeah that was typo from me.

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