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.