MATLAB: Fminsearch, Function arguments must be symbolic variables, and function body must be sym expression.

fminsearch

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!

Best Answer

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