How to calculate a natural logarithm of a function handle?

Hello,

I would like to calculate the ln of the function Inum which is an integral of a symbolic function y(t). For that I converted y(t) into a function handle.

   ynum=matlabFunction(y);
   Inum=@(x)integral(ynum,0,tfail(i));
   f = log(Inum);

Does anybody know why the code above is not working?

Answer 1

[Matt J]

You define Inum as an anonymous function of x, but 'x' appears nowhere in the expression

integral(ynum,0,tfail(i))

Also, since Inum is a function, then its log should also be a function

f=@(x) log(Inum(x));