fmincon() error too many input arguments

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connie
connie 2011-1-21
Dear peer users,
I got stuck with fmincon(). I tried different approaches but all showed different errors.
#1 codes are:
out=(f1-1)^2+(f2-1)^2+(f3-1)^2+(f4-1)^2;
x1=sym('x1',[1 4]);
subs(out,{x,phi,lamda2,lamda4},{x1(1),x1(2),x1(3),x1(4)});
out1=matlabFunction(out);
x0=[pi/6 pi/6 -1 -2];
lb=[0 0 -20 -20];
ub=[2*pi 2*pi 0 0];
[x1,fval,exitflag,output]=fmincon(out1,x0,[],[],[],[],lb,ub);
Errors are: ??? Error using ==> sym.matlabFunction>@()NaN Too many input arguments.
Error in ==> fmincon at 574 initVals.f = feval(funfcn{3},X,varargin{:});
Error in ==> solveequs_new at 77 [x1,fval,exitflag,output]=fmincon(out1,x0,[],[],[],[],lb,ub); Caused by: Failure in initial user-supplied objective function evaluation. FMINCON cannot continue.
#2: Codes are out=(f1-1)^2+(f2-2)^2+(f3-3)^2+(f4-4)^2;
x1=sym('x1',[1 4]);
subs(out,{x,phi,lamda2,lamda4},{x1(1),x1(2),x1(3),x1(4)});
x0=[pi/6 pi/6 -1 -2];
lb=[0 0 -20 -20];
ub=[2*pi 2*pi 0 0];
[x1,fval,exitflag,output]=fmincon(@(x1)out,x0,[],[],[],[],lb,ub);
errors are ??? Error using ==> sym.sym>notimplemented at 2621 Function 'ge' is not implemented for MuPAD symbolic objects.
Error in ==> sym.sym>sym.ge at 823 notimplemented('ge');
Error in ==> nlconst at 739 elseif f >=0
Error in ==> fmincon at 758 [X,FVAL,LAMBDA,EXITFLAG,OUTPUT,GRAD,HESSIAN]=...
Error in ==> solveequs_new at 76 [x1,fval,exitflag,output]=fmincon(@(x1)out,x0,[],[],[],[],lb,ub);
I understand I need to convert symbolic expression to function. But either of above is now working. Can you tell me why?
Thanks!

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回答（1 个）

Walter Roberson
Walter Roberson 2011-1-21
For more information about the "too many input parameters" problem, please see my comments in your previous question about minimization.

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