Difficulty in calling values from main program to fsolve function

my version is MATLAB 7.10.0(R2010a) My main program is aa=10; ab=12; ac=18; x0=[0;0]; result=fsolve(@myfun3,x0);

My function is myfun3 created as function F=myfun3(x) F=[2*x(1)^2+(x(2)*aa)+ab;5*x(2)^2+x(1)+ac]; end

the error shown is ??? Undefined function or variable 'aa'.

Error in ==> myfun3 at 2 F=[2*x(1)^2+(x(2)*aa)+ab;5*x(2)^2+x(1)+ac];

Error in ==> fsolve at 254 fuser = feval(funfcn{3},x,varargin{:});

Error in ==> yyyy at 5 result=fsolve(@myfun3,x0);

Caused by: Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.

As i have sorted out the problem the function is not recognising the value of aa,ab and ac from the main problem.Why is that?????

Answer 1

[Mischa Kim]

BITS, you need to pass the parameters ( aa, etc.) to the function:

 function my_main()
 aa     = 10; ab = 12; ac = 18;
 param  = [aa,ab,ac];           % define parameter vector
 x0     = [0;0];
 f      = @(x) myfun3(x,param); % define function (handle) 
 result = fsolve(f,x0);
 disp(result)
 end

 function F = myfun3(x,param)
 aa = param(1);                 % back out parameters from vector
 ab = param(2);
 ac = param(3);
 F  = [2*x(1)^2 + (x(2)*aa) + ab;...
       5*x(2)^2 +  x(1)     + ac];
 end

[BITS]

Thank you Mischa Kim :-)