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[liucheng83 <question189288@xxxxxxxxxxxxxxxxxxxxx>]

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

liucheng83 posted a new comment:
Really, I want to build an array like this
tt=[]
tt=[ForceEngine(ids=[i],force=(0,0,i),label="ttForce") for i in ids_sp]
and  tt[0],tt[i] are the ForceEngine,
but I donnot know how to add it to the O.engine if ids_sp is a big number. 
a loop method like "for i in ids_sp " cannot be insert to O.engine like this:

O.engines=[
	ForceResetter(),
	InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=interactionRadius,label='aabb'),Bo1_Facet_Aabb()]),
	InteractionLoop(
		[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=interactionRadius,label='Ig2ssGeom'),
		Ig2_Facet_Sphere_ScGeom(),],
		[Ip2_FrictMat_FrictMat_FrictPhys()],
		[Law2_ScGeom_FrictPhys_CundallStrack()]
	),
	## Apply tt Force to some particles
	ForceEngine(ids=[i],force=(0,0,i),label="dragForce"+str(i)) for i in ids_spSlurry   # a message SyntaxError: invalid syntax is given
	NewtonIntegrator(damping=0.1,gravity=(0,0,-9.81)),
	PyRunner(command='checkInteraction()',iterPeriod=iterPeriod_checkInteraction,label='checker')
]

# a message SyntaxError: invalid syntax is given because of using for
loop

PyRunner, which executes O.forces.addF for each particle in each
iteration may be a method, but it is not  the most efficient one, maybe
the force keep as a constant for a time, and then anoter constant for a
next time.

How to solve it, please give some advice, somebody, thank you!

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