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From: Vyjayanthi A on 13 Mar 2010 10:22
Hi
What does the below error mean
??? Subscripted assignment dimension mismatch.

Error in ==> fminsearch at 175
fv(:,1) = funfcn(x,varargin{:});

I am trying to solve 6 unknowns in 6 equations using fminsearch, and every time I solve these functions it is displaying the 6 unknown variables as the initial guess and not the original answers.

Any kind of help is highly appreciated.

Thanks
From: John D'Errico on 13 Mar 2010 12:44
"Vyjayanthi A" <vinzav(a)gmail.com> wrote in message <hngait$40o$1(a)fred.mathworks.com>...
> Hi
> What does the below error mean
> ??? Subscripted assignment dimension mismatch.
>
> Error in ==> fminsearch at 175
> fv(:,1) = funfcn(x,varargin{:});
>
> I am trying to solve 6 unknowns in 6 equations using fminsearch, and every time I solve these functions it is displaying the 6 unknown variables as the initial guess and not the original answers.
>

Fminsearch is NOT an equation solver. It is NOT
designed to solve a system of equations in multiple
unknowns.

It is designed to minimize a SINGLE function of
multiple variables.

Use the proper tool for the problem. Fsolve from
the optimization toolbox does this.

If you do not have the optimization toolbox, then
you must formulate the problem as a minimization
problem. Formulate it as the sum of squares of the
residuals to your 6 equations. Then fminsearch will
in theory be able to solve your problem. Note that
6 variables tends to be on the large size for
fminsearch to work happily, but it should work.

John
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