How to evaluate a user input function at a given point?

I'm unsure how to evaluate a given function at a given point X. Hypothetically, the user can input any function using any letter as a desired variable. How can I evaluate the function at the initial point given. I was thinking I could use the syms command. However, I'm unsure of what letter variable they would use. For instance, if the function was x+1 vs y+1, how can I ensure that the "initialX" is evaluated in place of x or y in the given function?

function y = randFunc(initialX, func)

    y = func(initialX);
    display(y);

Answer 1

[Matt J]

If func is a Function Handle, then the code you've shown should do exactly what you want.

[Maryam Ansari]

How do I make func a Function Handle?

[Matt J]

There are various ways, and they are explained at the link I gave you.

[Walter Roberson]

In this case if func is given in the form of a symbolic expression, then use matlabFunction() to turn it into a function handle.