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[Kieran <question694628@xxxxxxxxxxxxxxxxxxxxx>]

New question #694628 on Yade:
https://answers.launchpad.net/yade/+question/694628

I've been trying to adjust the open source (https://gitlab.com/yade-dev/trunk/blob/master/doc/sphinx/tutorial/03-oedometric-test.py) test to track Cartesian coordinates of each particle during a uniaxial compression test. 

I have already been using a .py program in Yade that simply tracks the Cartesian coordinates of a generated particle cloud that falls into a volume element. What I have been struggling with was implementing the tracking portion of the code I am comfortable with, into the "03-oedometric-test.py" linked above. 

The "03-oedometric-test.py" program collects different data than what I want and I have not been successful using the following lines that I see fit:

{
def myaddData():
   if (O.iter%8==0):
      # open file
      fil=open("timeStep."+str(O.iter),"a+")
      fil.write ('id \t x \t y \t z \t vz \t radius \t force \n')
      for b in O.bodies:
         if (type(b.shape)==Sphere):
            number,rad=b.id,b.shape.radius
            x,y,z=b.state.pos[0],b.state.pos[1],b.state.pos[2]
            veloc,force=b.state.vel[2],O.forces.f(b.id)
            fil.write("{:d}\t{:.3g}\t{:.3g}\t{:.3g}\t{:.3g}\t{:.3g}\t{}\n".format(number,x,y,z,veloc,rad,force)) # ( .format = % )
}

Using the code above, I've been mainly thinking how I need to replace the following code seen in the linked program:
{
def addPlotData():
	if not isinstance(O.bodies[-1].shape,Wall):
		plot.addData(); return
	Fz=O.forces.f(plate.id)[2]
	plot.addData(Fz=Fz,w=plate.state.pos[2]-plate.state.refPos[2],unbalanced=unbalancedForce(),i=O.iter)

# besides unbalanced force evolution, also plot the displacement-force diagram
plot.plots={'i':('unbalanced',),'w':('Fz',)}
plot.plot()
}

I'm generally struggling on the how to add/remove the necessary lines of code to collect the Cartesian coordinates within the "03-oedometric-test.py" program while still conducting the uniaxial compression test. 

Any suggestions? 

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