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    %% Monitor Optimization Process
% Set options to monitor the process as |fminsearch| attempts to locate a
% minimum.
%%
% Set options to plot the objective function at each iteration.
options = optimset('PlotFcns',@optimplotfval);
%%
% Set the objective function to Rosenbrock's function,
%
% $$f(x) = 100(x_2 - x_1^2)^2 + (1 - x_1)^2.$$
%
% The function is minimized at the point |x = [1,1]| with minimum value
% |0|.
%%
% Set the start point to |x0 = [-1.2,1]| and minimize Rosenbrock's
% function using |fminsearch|.

fun = @(x)100*(x(2) - x(1)^2)^2 + (1 - x(1))^2;
x0 = [-1.2,1];
x = fminsearch(fun,x0,options)