Re: [ns] problem when running nam

[Xuan Chen <xuanc@ISI.EDU>]

On Tue, 5 Jun 2001, Shuju Wu wrote:

> Thanks, and please check this: (I'm not good at Unix)
> 
> 1. I got that error message because I telnet from my 
> workstation to a faster processor in the same system, 
> and used EXPRORT DISPLAY. If I run NAM in my workstation, 
> then it works.
You probably need to check the shell you are using right now and figure
out the right environment variable setups.

> 
> 2. I'm not working on mobile simulations, but I used 
> the on-off traffic generator, where random numbers are 
> used.
the ON/OFF periods are generated according to a certain random
distribution (exponential or pareto), and that's why random number is
generated.

-chen xuan

 > 
> Wu
> 
> 
> On Tue, 5 Jun 2001, Lloyd Wood wrote:
> 
> > On Tue, 5 Jun 2001, Shuju Wu wrote:
> > 
> > > It's in the all-in-one package, in both 2.1b6 
> > > and 2.1b7 this happens now. But a year ago, 
> > > I used 2.1b6, there was no this problem.
> > > (all on Solaris). Someone please, help me.
> > 
> > Any changes in version(s) of Solaris? Of your compiler?
> > My best guess is that you're doing mobility simulations,
> > and that in nam:
> > 
> > [~nam]$ grep random\(\) *.cc
> > anetmodel.cc:	    ((Random::random()&0xffff)/32768.0 - 1.0);
> > anetmodel.cc:	    ((Random::random()&0xffff)/32768.0 - 1.0);
> > random.cc:random() GCC_THROW
> > random.cc:	printf("random() called in ns.\nRandom is not portable,
> > please use Random::uniform() instead.\n");
> > 
> > is causing your problem. (That error message needs fixing to
> > indicate whether ns or nam...)
> > 
> > In ns there's still:
> > 
> > mobilenode.cc:	dX_ = (double) Random::random();
> > mobilenode.cc:	dY_ = (double) Random::random();
> > 
> > which is odd after all, Random::uniform() returns a double anyway, and
> > I've never even heard of uniform_positive_int().
> > 
> >         static int random() { return rng()->uniform_positive_int(); }
> >         static double uniform() { return rng()->uniform_double();}
> > 
> > Code says:
> > 
> > void
> > MobileNode::random_direction()
> > {
> >  /* this code isn't used anymore -dam 1/22/98 */
> > 
> > so why is it there?
> > 
> > Edit, recompile, report how you get on.
> > 
> > L.
> > 
> > > > > Can anyone help me with this?
> > > > > after I generate out.nam file and ran NAM, 
> > > > > an error message said:
> > > > > 
> > > > > random() called in ns.
> > > > > Random is not portable, please use Random::uniform() instead.
> > > > > Abort
> > 
> > <L.Wood@surrey.ac.uk>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>
> > 
> > 
> 

-- 
Xuan Chen
USC/ISI