yade-users team mailing list archive

["Kien Dang, Mr" <kien.dang@xxxxxxxxxxxxxx>]

Thank you so much, the problem is too stupid: I forgot to define the ForceClassIndex.

-----Original Message-----
From: yade-users-bounces@xxxxxxxxxxxxxxxx on behalf of Bruno Chareyre
Sent: Fri 1/25/2008 4:47 AM
To: yade-users@xxxxxxxxxxxxxxxx
Subject: Re: [Yade-users] YADE crash when spheres generated during simulation
 
One idea comes to mind...
Perhaps the vector containing forces is not resized immediatly to 
(NumberOfOldSphere + NumberOfNewSpheres). So you are accessing component 
(n+...) of a vector of size n.
Perhaps try to run at least one timestep before computing the unbalanced 
force. It can be done by just reordering engines in the loop : place the 
"addSpheres" engine _after_ the "computeForce" engine.

If it doesn't help. Try to decompose this line  :

f= (static_cast<Force*>   ( ncb->physicalActions->find( (*bi)->getId() , ForceClassIndex).get() )->force).Length();

as 

int i = (*bi)->getId();
shared_ptr <physicalActions> pa = ncb->physicalActions->find( 
(*bi)->getId() , ForceClassIndex);
etc...

and see precisely where the problem is.
Also, are you sure that ForceClassIndex is defined correctly? Does it 
work before you generate new spheres?

Bruno





Kien Dang, Mr a écrit :
> Hi all,
>
> I am trying to generate spheres during the simulation, when the old group of shpere is stable, a new group of spheres is generated and the stability check is perfrom similarly to the function computeunbalancedforce in TRIAXIAL TEST. YADE however crash whenever the physicalAction class accessed through a pointer. The thread is begin at the operator get() in the share_ptr in boost library. I tried to figured it out in several days but all the attempts failed.
>
> The code is attached hereunder:
>
>
> Real MeanUnbalanced=0;
> 	long nBodies = 0;
>         BodyContainer::iterator bi    = bodies->begin();
>         BodyContainer::iterator biEnd = bodies->end();
>         Real f;
>         for(  ; bi!=biEnd ; ++bi ) 
> 	{
>         	if ((*bi)->isDynamic) 
> 		{
>             CRASH HERE --------->f= (static_cast<Force*>   ( ncb->physicalActions->find( (*bi)->getId() , ForceClassIndex).get() )->force).Length();
>                 	MeanUnbalanced += f;
>                 	if (f!=0) ++nBodies;
>                 }
> 	}
>         if (nBodies != 0 && MeanForce != 0) 
> 	{
> 		MeanUnbalanced = MeanUnbalanced/nBodies/MeanForce;
> 	}
>         return  MeanUnbalanced;
>
>
>
> Could anyone give me some hints about the problems? If you need a whole class please let me know.
>
> Thanks in advance,
>
> Kien Dang
> _______________________________________________
> Yade-users mailing list
> Yade-users@xxxxxxxxxxxxxxxx
> https://lists.berlios.de/mailman/listinfo/yade-users
>
>   


-- 
 
_______________
Chareyre Bruno
Maitre de conference

Institut National Polytechnique de Grenoble
Laboratoire 3S (Soils Solids Structures) - bureau E145
BP 53 - 38041, Grenoble cedex 9 - France
Tél : 33 4 56 52 86 21
Fax : 33 4 76 82 70 43
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