Problems with an integral

I want to solve following integral:

my attempt is looking like that: (but it's not working, always got an error "Incorrect use of '=' operator. To assign a value

to a variable, use '='. To compare values for

equality, use '=='.")

clear all;
clc; 

alpha1 = 1.8;
kappa1 = 25;

alpha2 = 2.2;
kappa2 = 27;

x = 10;

syms x z; 
f = alpha1 * alpha2 * kappa1 * kappa2 * [(x-z)^(kappa1-1) * x^(kappa2-1)*exp(-alpha1*(x-z)^kappa1-alpha2*(x^kappa2-(x-z)^kappa2)); 
I = int(f,z,[0 inf]);
fVpa = vpa(I)

[KSSV]

Typo error....why [? check

Answer 1

[KSSV]

alpha1 = 1.8;
kappa1 = 25;
alpha2 = 2.2;
kappa2 = 27;

syms x z; 
f = alpha1 * alpha2 * kappa1 * kappa2 * (x-z)^(kappa1-1) * x^(kappa2-1)*exp(-alpha1*(x-z)^kappa1-alpha2*(x^kappa2-(x-z)^kappa2)); 
I = int(f,z,[0 inf]);
fVpa = vpa(I)

[Antonio Spiere]

Thanks!