Hi Sebastian,

The problem is solved. The the molecular name matters. Thanks a lot!

Best,
Han

On Wednesday, January 30, 2013 1:25:02 PM UTC+1, Sebastian wrote:
>
> On 01/30/2013 12:03 PM, Han Wang wrote: 
>
> Hi Han, 
>
>
> I dont know if it helps, but you may try too look at your topology with 
> csg_dump to see how votca reads the molecule names. Btw.: you can also 
> use wildcards (--molname Meth*) to extend your selection to all 
> molecules beginin with Meth. 
>
> Best 
> Sebastian 
> > Hi, 
> > 
> > I am calculating the thermodynamic force for the methane solved in 
> > water system. The scg_density program complains the following 
> > 
> > Running critical command 'csg_density --trj traj.xtc --top topol.tpr 
> > --out Meth.dist.new --begin 10 --first-frame 0 --molname Meth --axis x 
> > --step 0.01' 
> > Reading file topol.tpr, VERSION 4.6.1-dev-20130124-fb5b9bd-dirty 
> > (single precision) 
> > I have 13756 beads in 3456 molecules 
> > Reading frame       0 time    0.000   
> > Reading frame      10 time   10.000   rmax: 7.53057 
> > axis: x 
> > Bins: 753 
> > an error occurred: 
> > No molecule in selection 
> > 
> > why it complains "No molecule in selection" ? Although the density of 
> > methane is very low, it is possible in one frame one cannot find any 
> > molecule in one bin. But after doing average of a lot of frames, the 
> > density value is not zero for all bins, so the th force can be 
> > calculated. Can anybody suggest how to solve it? Thanks! 
> > 
> > Best, 
> > Han 
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