Date: Jun 26, 2013 2:56 AM
Author: Torsten
Subject: Re: Warning: Explicit integral could not be found.
"Torsten" wrote in message <kqe218$49a$1@newscl01ah.mathworks.com>...

> "Ferra " <ferra.xu@yahoo.com> wrote in message <kqdfvu$psn$1@newscl01ah.mathworks.com>...

> > Hi

> >

> > I'm trying to solve this integration but it gives me this error:

> > Warning: Explicit integral could not be found.

> >

> > syms a b

> > Q = (1/(2*pi*lams)) * exp( - (a^2 + b^2)/(2*lams));

> > q = int(int(Q,b,0,sqrt((lams^2) - (a^2))),a,0,lams);

>

> Use numerical integration for the function received by the inner integral.

>

> Best wishes

> Torsten.

Or much better:

Perform integration in polar coordinates.

Best wishes

Torsten.