Question

matlab 求函数最小值

>> syms t real
>> x=[t-1,t,t+2]';
>> y=@(t)x'*x;
>> fminsearch(y,0)
程序运行出错
The following error occurred converting from sym to double:
Error using mupadmex
Error in MuPAD command: DOUBLE cannot convert the input expression into a
double array.
If the input expression contains a symbolic variable, use the VPA function
instead.
Error in fminsearch (line 191)
fv(:,1) = funfcn(x,varargin{:});

Answer 1

syms t real
x=[t-1,t,t+2]';
y=x'*x;
y=inline(y);
fminsearch(y,0)
应该是这样的

追问

已经搞定了，这样写就行了
>> syms t real
>> x=[t-1,t,t+2]';
>> y=@(t)subs(x'*x);
>> fminsearch(y,0)