MATLAB Mathematics - SERC - Index of

4 Function Functions
The number of function evaluations, the number of iterations, and the
algorithm are returned in the structure output when you provide fminbnd or
fminsearch with a fourth output argument, as in
or
[x,fval,exitflag,output] = fminbnd(@humps,0.3,1);
[x,fval,exitflag,output] = fminsearch(@three_var,v);
Output Functions
An output function is a function that an optimization function calls at each
iteration of its algorithm. Typically, you might use an output function to
generate graphical output, record the history of the data the algorithm
generates, or halt the algorithm based on the data at the current iteration. You
can create an output function as an M-file function, a subfunction, or a nested
function.
You can use the OutputFcn option with the following MATLAB optimization
functions:
• fminbnd
• fminsearch
• fzero
This section covers the following topics:
• “Creating and Using an Output Function” on page 4-15
• “Structure of the Output Function” on page 4-16
• “Example of a Nested Output Function” on page 4-17
• “Fields in optimValues” on page 4-19
• “States of the Algorithm” on page 4-20
• “Stop Flag” on page 4-20
4-14