fminsearch, Function arguments must be symbolic variables, and function body must be sym expression.

Hi All, my code is:

p=10;
spdf = @(x) 3.*(50.^3)./(x+50).^(3+1)./(1-(50./(50+50)).^3);
fun2 = @(x,z) min(x,max(0,fzero(@(y) (100-p-x+y).^(-1)-(2.*z(2)+4.*z(1).*y).^2,0))).^2.*spdf(x); 
fun3 = @(z) integral(@(x) fun2(x,z),0,50,'arrayvalued', true);
fun21 = @(x,z) min(x,max(0,fzero(@(y) (100-p-x+y).^(-1)-(2.*z(2)+4.*z(1).*y).^2,0))).*spdf(x); 
fun31 = @(z) integral(@(x) fun21(x,z),0,50,'arrayvalued', true);  
funfun(z)=@(z) abs((fun31(z)-10).*(fun3(z)-178.57145));
fminsearch(funfun(z),[0.002,0.04])

The error is:

Error using sym/subsindex (line 836)
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression.

Anyone can help me fix my code? Anyhelp is appreciated!

Answer 1

[madhan ravi]

funfun = @(z) abs((fun31(z)-10).*(fun3(z)-178.57145));
 %    ^----removed it
fminsearch(funfun,[0.002,0.04])

[madhan ravi]

P.S - It takes ~39 seconds to evaluate. I have no idea what your trying to evaluate.

But for sure the result obtained is

ans =

    0.0015    0.0003