What does output describe in fminbnd?

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Minh Handsome 2016-1-12

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https://ww2.mathworks.cn/matlabcentral/answers/263442-what-does-output-describe-in-fminbnd

编辑： Stephen23 2016-1-12

I met some problems about 'fminbnd'. [x,fval,exitflag,output] = fminbnd(...). I don't understand when exitflag=-1, and I have no idea what happened in the output. Can anyone explain those for me? I will appreciate that.

output =

    iterations: 24
     funcCount: 25
     algorithm: 'golden section search, parabolic interpolation'
       message: [1x111 char]

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Answer 1

Stalin Samuel 2016-1-12

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[x,fval,exitflag,output] = fminbnd(...) returns a structure output that contains information about the optimization in the following fields:
algorithm 'golden section search, parabolic interpolation'
funcCount Number of function evaluations
iterations Number of iterations
message Exit message *source

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Answer 2

Stephen23 2016-1-12

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在 MATLAB Online 中打开

Why not start by reading the documentation? You can locate the documentation in 0.5 seconds using your favorite internet search engine. This is what the fminbnd documentation says:

[x,fval,exitflag] = fminbnd(...) returns a value exitflag that describes the exit condition of fminbnd:
1   fminbnd converged to a solution x based on options.TolX.
0   Maximum number of function evaluations or iterations was reached.
-1  Algorithm was terminated by the output function.
-2  Bounds are inconsistent (x1 > x2).

You can find explanations of the rest of the outputs. You might like to read it.

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Minh Handsome 2016-1-12

what does 'Algorithm was terminated by the output function.' mean ?

Stephen23 2016-1-12

编辑：Stephen23 2016-1-12

This means that the routine was terminated before it returned a solution. This happens when the user terminates the routine via the output function. The output function is described here:

http://www.mathworks.com/help/matlab/math/output-functions.html

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