New question #189288 on Yade:
https://answers.launchpad.net/yade/+question/189288

Hi guys,

I have a model with several load steps. One load step consists in applying 
forces from the previous simulation. Well, I can save the forces with saveVars 
and load them into the current simulation. Now I have to apply these forces to 
a list of particles. The forces are not the same for all the particles and I 
want to keep them the same during the simulation. So basically, the  let's call 
them external "constant" forces are always acting on the particles in addition 
to the forces which come from the simulation.

I was wondering if there is a efficient way to set such forces. I had a look at 
ForceEngine, but the problem is that this engine applies a constant force to a 
list of particles. In my case the forces are not the same for the list of 
particles. I think in order to get it right I would have to call ForceEngine or 
maybe O.forces.addF for each particle in each iteration. This isn't efficient 
at all.

What do you suggest? 

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