New question #682883 on Yade:

I'd like to calculate the mass content of a group of spheres, as far as I know, 
we can obtain a mass of one sphere by:
I'd like to ask that if we can obtain the mass of a group of spheres like: 
appending some spheres with a same label, like:
then we can obtain the total mass of spheres with label1, and label2 
I have tried in Yade, it seems that we can not give each sphere a label, is 
there any way that we can classify the spheres to different groups so that we 
can just loop in one group of spheres to calculate the mass?
Thanks in advance!

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