Thread Subject: fmincon ceq--can I use it as linear constraint?

Here is my optimization problem:
a is 3*1 vector which is equal to cap which is also a 3*1 vector with real value.

[a,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = ...
    fmincon(@function,a0,aeqa,beqa,[],[],lba,uba,@mycon,...,
    optionsa,b,c,d,e);

function [c,ceq]=mycon(a)
ceq=a-cap;
c=[];

＂Error:　　Too many input arguments.

Error in ==> equil_3investors_know_onlytype_new at 93
[a] = ...＂

I am wondering to use ceq to construct the linear constraint problem but it doesnt work. Could someone help me a bit about this?

Many thanks in advance,

QZ

"Q Zhang" <silence_qunzi@hotmail.com> wrote in message
news:hcbsr1$icd$1@fred.mathworks.com...
> Here is my optimization problem:
> a is 3*1 vector which is equal to cap which is also a 3*1 vector with real
> value.
>
> [a,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = ...
> fmincon(@function,a0,aeqa,beqa,[],[],lba,uba,@mycon,...,
> optionsa,b,c,d,e);
>
> function [c,ceq]=mycon(a)
> ceq=a-cap;
> c=[];
>
> ＂Error:　　Too many input arguments.
>
> Error in ==> equil_3investors_know_onlytype_new at 93
> [a] = ...＂
>
> I am wondering to use ceq to construct the linear constraint problem but
> it doesnt work. Could someone help me a bit about this?

If you specify additional inputs to FMINCON in this way, intending for them
to be passed into your objective function, your nonlinear constraint
function MUST also accept those additional inputs, even if it doesn't need
or want to use them.

If you're using MATLAB 7.0 (R14) or later and instead use an anonymous
function to specify your objective function:

a = 1;
b = 2;
c = 3;
d = 4;
e = 5;
[a,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = ...
   fmincon(@(x) function(x, a, b, c, d,
e),a0,aeqa,beqa,[],[],lba,uba,@mycon,...,
   options);

then your constraint function doesn't have to accept any additional inputs.

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ

"Steven Lord" <slord@mathworks.com> wrote in message <hcc8uh$h4$1@fred.mathworks.com>...
>
> "Q Zhang" <silence_qunzi@hotmail.com> wrote in message
> news:hcbsr1$icd$1@fred.mathworks.com...
> > Here is my optimization problem:
> > a is 3*1 vector which is equal to cap which is also a 3*1 vector with real
> > value.
> >
> > [a,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = ...
> > fmincon(@function,a0,aeqa,beqa,[],[],lba,uba,@mycon,...,
> > optionsa,b,c,d,e);
> >
> > function [c,ceq]=mycon(a)
> > ceq=a-cap;
> > c=[];
> >
> > ＂Error:　　Too many input arguments.
> >
> > Error in ==> equil_3investors_know_onlytype_new at 93
> > [a] = ...＂
> >
> > I am wondering to use ceq to construct the linear constraint problem but
> > it doesnt work. Could someone help me a bit about this?
>
> If you specify additional inputs to FMINCON in this way, intending for them
> to be passed into your objective function, your nonlinear constraint
> function MUST also accept those additional inputs, even if it doesn't need
> or want to use them.
>
> If you're using MATLAB 7.0 (R14) or later and instead use an anonymous
> function to specify your objective function:
>
> a = 1;
> b = 2;
> c = 3;
> d = 4;
> e = 5;
> [a,FVAL,EXITFLAG,OUTPUT,LAMBDA,GRAD,HESSIAN] = ...
> fmincon(@(x) function(x, a, b, c, d,
> e),a0,aeqa,beqa,[],[],lba,uba,@mycon,...,
> options);
>
> then your constraint function doesn't have to accept any additional inputs.
>
> --
> Steve Lord
> slord@mathworks.com
> comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
>
Many thanks Steven !! It works now:)