infinite integration with matlab

Question

I want to compute the following type of integrals in Matlab.

$\int _{0}^\infty e^{-(u*u)} du$

It is the integral of function e^-(u)*u and the boundaries are zero and infinity. This integral should return 1.

How can I do this in Matlab?

The integrand that you show in the formula is e^(-u*u), not e^(-u)*u. You should edit the formula in the question — lucianopaz, Dec 19 '16 at 13:05

score 5 · Answer 1 · answered Aug 07 '12 at 05:27

5

And if you don't have the symbolic toolbox, or want more speed, quadgk supports infinite limits:

f = @(x) x.*exp(-x);
a = quadgk(f, 0, inf) 

a =
    1.000000000000000e+00

answered Aug 07 '12 at 05:27

Rody Oldenhuis

score 2 · Answer 2 · answered Aug 07 '12 at 04:50

2

syms u
int(exp(-u)*u, u, 0, inf)

answered Aug 07 '12 at 04:50

Steve Tjoa

2 Answers2