How do I call a function for optimization that includes variables I'm not interested in?

I am a new user of Matlab. I want to minimize a function. However, I know that if a function is to be minimized it has to accept a vector and return a scalar. The function I want to minimize is:

[xout varxout gradout vargradout report] = ...

    gek(xi,y,erry*ones(size(y)),grad,errgr*ones(size(grad)),xiout,options);

I am only interested in minimizing xout with respect to xiout. i.e xout = f(xiout).

How can I do this?

Ps. I have access to the optimization toolbox.

Thanks in advance

Answer 1

[Matt J]

See Passing Extra Parameters.