What does output describe in fminbnd?

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]

Answer 1

[Stalin Samuel]

• [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

Answer 2

[Stephen23]

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.

[Minh Handsome]

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

[Stephen23]

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