niudun.m

用拟牛顿法求极小值点

%用拟牛顿法求极小值点
[ux,sfval,uexit,uoutput,grid,hess]=fminunc(ff,x0)
%Warning: Gradient must be provided for trust-region method;
%using line-search method instead.
%> In D:\MAT53\toolbox\optim\fminunc.m at line 202
%Optimization terminated successfully:
%Current search direction is a descent direction, and magnitude of
%directional derivative in search direction less than 2*options.TolFun
ux =1.0000 1.0000
sfval =1.9118e-011
uexit =1
uoutput =
iterations: 26
funcCount: 162
stepsize: 1.2992
firstorderopt: 5.0023e-004
algorithm: 'medium-scale: Quasi-Newton line search'
grid =
1.0e-003 *
-0.5002
-0.1888
hess =
820.4031 -409.5497
-409.5497 204.7720