fsolve with collocation (outside of the function)

Consider the following problem. The problems solves the linear(and nonlinear) equation correctly

syms Y11 Y12

r=fsolve(@noneqih,[0 0 ]);

function F=noneqih(co)

Y11=co(1);Y12=co(2);

F=[Y11+Y12-3; Y11-Y12-1]

end

but if you want the values of F set outside of the function noneqih, you can not import them inside e.g the following problem dosnt work

syms Y11 Y12

Agg=[Y11+Y12-3; Y11-Y12-1];

r=fsolve(@noneqih,[0 0 ]);

function F=noneqih(co)

global Agg;

Y11=co(1);Y12=co(2);

F=Agg

end

the second problem is needed when you want to solve the equations arise from other procedures

[Stephen23]

I doubt that symbolic and/or global variables are helping you... in the first example they don't seem to be doing anything anyway.

Why not just parameterize a normal MATLAB function?:

https://www.mathworks.com/help/matlab/math/parameterizing-functions.html

For example, simply create a function handle for Agg and pass that.

[salman yazdani]

Dear Stephen,

Thanks for your valuable help. The problem can be simplified as

Agg=@(co) [co(1)+co(2)-3; co(1)-co(2)-1];

r=fsolve(Agg,[0 0 ]);

and it can be solved easily. But there arise another problem. As I told, the Agg function is calculated from an algebraic equation so I can not define variables as co(1) co(2) etc. when using co=sym('co',[1 2]);

it results to co=[co1 co2] and the following program doesnt work!

Agg=@(co) [co1+co2-3; co1-co2-1];

r=fsolve(Agg,[0 0 ]);