This works for me:
test_test = @(x) -x.^2;
fun = @(x) exp(test_test(x)).*log(x).^2;
q = integral(fun,0,Inf)
q =
1.9475
You have to call your function as ‘test_test(x)’ inside ‘fun’, not as ‘A’. (I created an anonymous function for of ‘test_test(x)’ for convenience. If you are using it as a function file, it would work the same way in ‘fun’.)
