diff + integral in one function?

Hi, as a beginner in matlab I have the following problem,

is it possible to use diff and integral in one function?

I want to calculate k of the image.

It would be ok to give x a fix value.

Matlab gives me the following error: [b]First input argument must be a function handle.[/b]

Is there another syms needed?

Using a @(z) at the first part of the intregral equals : [b]Undefined function 'diff' for input arguments of type 'function_handle'.[/b]

Many Thanks in advance, Lg Franz

Answer 1

[Walter Roberson]

diff is only differentiation for symbolic expressions and symbolic functions, not for function handles. You should define y as a symbolic function.