[Octave] optimset()

Create options struct for optimization functions.

optimset('parameter', value, ...);
%设置所有参数及其值，未设置的为默认值

optimset(optimfun);
%设置与最优化函数有关的参数为默认

optimset(old, 'parmeter', 'value', ... );
%复制已有的设置，并修改特定项

optimset(old, new);
%两项合并

　　

GradObj

When set to "on", the function to be minimized must return a second argument which is the gradient, or first derivative, of the function at the point X.  If set to "off" [default], the gradient is computed via finite differences.

MaxIter

Maximum number of algorithm iterations before optimization stops.  Must be a positive integer.