How to do optimisation with multiple input variables?

I also have a data set(4*100). Height(1*100), width(1*100), Spacing(1*100) and Cd(1*100). I have tried to make a Fit curve from matlab toolbox and save it as a matlab function and i can use it to find the minimum value of Cd but the problem is my objective function is a*width + b*height + c*Cd...where a,b,c are positive constant. how to optimised it ?

Answer 1

[Alan Weiss]

In Optimization Toolbox you have to put all your control variables (those that you can change to try to find a minimum) into one vector. So, for example, if you have three variables a, b, c you make a vector x with

 a = x(1);
 b = x(2);
 c = x(3);

See the documentation.

Alan Weiss

MATLAB mathematical toolbox documentation

[Shashank Bajaj]

but the problem is that i have created by function by doing the curve fitting using lowness option and i am using this curve fitting function to find the minimum value.