how to integrate a function from 0 to inf?

I need to integrate a function and i would like to know if it exist a way to integrate between a real number and inf, or a way to approximate the process. Thanks for help

Answer 1

[Alessandro Masullo]

You can, but it would require... an infinite time :)

The answer mostly depends on your function. You could evaluate the function (analytic, I suppose) from 0 to an arbitrarily high number and then use sum, trapz, or any other integration method.