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[Christian Jakob <question190529@xxxxxxxxxxxxxxxxxxxxx>]

Question #190529 on Yade changed:
https://answers.launchpad.net/yade/+question/190529

Christian Jakob posted a new comment:
What is the best way to make a loop over all interactions, i tried this,

	#determine contacts that are below water_height
	for xx in sphID:
		x = O.bodies[xx]
		if ((x) and (isinstance(x.shape,Sphere))):
			for yy in sphID:
				y = O.bodies[yy]
				if ((y) and (isinstance(y.shape,Sphere))):
					if ((xx != yy) and (O.interactions[xx,yy].isReal)):
						i=O.interactions[xx,yy]	
						z_int=i.geom.pos[2]	#z coordinate of interaction
						if z_int < water_height:
							print z_int

but i get

  File "5-final.py", line 61, in <module> 
    if ((xx != yy) and (O.interactions[xx,yy].isReal)):
IndexError: No such interaction

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