I don't get this

global Kp;
>> Kp=5

Kp =

       5

>> global e ; 
>> e = 2;
>> func = Kp*e

    func =

      10

>> q= int(Kp*e, e, 0, 2)

??? Undefined function or method 'int' for input arguments of type 'double'.

[the cyclist]

In the future, you might want to give your questions a more meaningful title.

Answer 1

[Walter Roberson]

int() is a function from the symbolic toolbox, that applies only to symbolic expressions (or character strings that represent symbolic expressions.) I suggest trying

syms e
q = int(Kp*e, e, 0, 2)