What Is Optimization Toolbox?

fzeroDisplayFunValCheckOutputFcnLevel of display. 'off' displays no output;'iter' displays output at each iteration;'final' displays just the final output;'notify' (default) displays output only ifthe function does not converge.Check whether objective function valuesare valid. 'on' displays an error whenthe objective function returns a value thatis complex or NaN. 'off' (the default)displays no error.Specify one or more user-defined functionsthat an optimization function calls ateach iteration. See “Output Function” onpage 6-16.TolX Termination tolerance on x.OutputArguments“Function Arguments” on page 6-2 contains general descriptions ofarguments returned by fzero. This section provides function-specificdetails for exitflag and output:exitflagInteger identifying the reason the algorithmterminated. The following lists the values of exitflagand the corresponding reasons the algorithmterminated.1 Function converged to asolution x.-1 Algorithm was terminated bythe output function.-3 NaN or Inf function value wasencountered during search foran interval containing a signchange.8-125